Research Interests - Indian Institute of Science Education and

NMR Lab
Femto-Laser Lab
Ultra-Low Temperature Lab
BEC and Photons Lab
Cosmology
String Theory
General Relativity
Correlated & Disordered
Electron Systems
Nonlinear Dynamics
& Complex Systems
Quantum Computing
Novel Materials Lab
Statistical Physics
Soft Matter Physics
Biophysics
Condensed Matter Physics
Laser Physics
Quantum Thermodynamics
Physical Sciences
IISER Mohali
The Department of Physical Sciences has witnessed exciting growth in a
short period of eight years. This brochure represents, in a nutshell, this young
and vibrant department. Our mission is to contribute to the advancement of
the understanding of our physical world through basic and applied research,
and engage students in the excitement in the world of physics.
Our Department provides a challenging, yet supportive environment, in
which to pursue research and teaching goals, and we have strived to create an
atmosphere of collaboration and collegiality. Research in this Department
covers incredible range, encompassing phenomena spanning length scales
from nanometers to megaparsecs, and time scales from attoseconds to billions
of years! There is great variety in the Department, and we house many state-ofthe-art research laboratories.
The Department has been pro-active in running a successful teaching
program, and my colleagues are seeking bright and energetic students to
further strengthen and sustain the activities of the research groups, through
the Integrated PhD, PhD and post-doctoral programs. Members of this
Department are part of national bodies and they have received significant
external funding and awards from several sponsored projects from DST, DBT
and CSIR.
Hope you enjoy this virtual walk through our Department!
Prof. J. S. Bagla
8 September 2015
Quantum Information
Dr. Arvind
Professor
Arvind is a theoretical physicist whose research interests span the areas of quantum
information processing, quantum optics, foundations of quantum mechanics and research in
physics education.
Research Interests
Quantum Computing: Quantum computers when
functional, are expected to qualitatively outperform
their classical counterparts. Characterising quantum
entanglement and tracing its exact role in quantum
algorithms remains a challenging open problem.
I have worked on issues related to quantum
entanglement in the context of the Deutsch-Jozsa
algorithm and Parity Determining algorithm,
quantum dissipation and its control, optical schemes
for quantum computers and NMR implementations
of quantum information processors. My current
research interests in quantum information include
characterisation of bound state entanglement, role of
entanglement in quantum computation, quantum
crytography and physical implementations of
quantum computers.
Foundations of Quantum Mechanics: I have also been working on connection of Bell's
inequalities with non-classicality of states of the radiation field, formulation of Bell's
inequalities for multi-photon sources, geometric phases in quantum mechanics, different
approaches to the quantum measurement problem and in particular understanding weak
measurements. Quantum Optics: My research in quantum optics includes signatures of nonclassical behaviour for the radiation field such as squeezing, sub-Poissonian photon statistics
and antibunching, and application of group theoretic methods in quantum optics.
Physics Education: I am working on building new experiments for physics teaching which are
designed around a certain conceptual theme. Experiments developed so far include random
sampling of an AC source with a DC meter, a demonstration of Coriolis force, normal modes
and symmetry breaking in a 2D pendulum using a single oscillator, and a quantitative study of
ion diffusion.
Current Phd students in my group: Shruti Dogra (joint with Dr Dorai), Debmalya Das, Aakash
Sharawat, Chandan, Harpreet Singh (joint with Dr Dorai), Varinder Singh, Jaskaran Singh
Selected Recent Publications
•
Vikesh Siddhu and Arvind, Quantum Information Processing, vol 14, 3005 (2015).
•
Debmalya Das, Shruti Dogra, Kavita Dorai, and Arvind, Physical Review A, 92, 022307 (2015).
•
R Sengupta, Arvind and Ajit Iqbal Singh Physical Review A Vol 90, 062323 (2014).
•
Harpreet Singh, Arvind, and Kavita Dorai, Physical Review A, 90, 052329 (2014).
•
Debmalya Das and Arvind Physical Review A Vol 89, 062121 (2014).
•
R. Sengupta and Arvind Physical Review A Vol 87, 012318 (2013).
Minimal Renormalizable Susy
SO(10) GUTS
Non Renormalizable Susy SO(10)
GUTs
Unstrung
Large irreps but few (210,126,..)
Asymptotically Strong
#Parameters Minimal(26/38)
R_p :No ad hoc discrete symmetries
Falsifiable (Occam, Popper)
Matter Parity in SO(10) Higgs Matter distinct
Only Two Models
a) 210 + 126 + 126bar
b) 54 + 45 +126+126bar
Explicit SSB, Spectra , Threshold effects
3 Gen GUT SSB specific realistic Fermion fits
Dynamical Solution of Proton decay problem
String motivated
Small irreps but many (10,16,45,54...)
Asymptotically Free ?
Unlimited # parameters, Baroque ?
Ad-hoc /String inspired discrete to replace R_p
Unfalsifiable ?
R-parity broken. Higgs-Matter mix
Plethora of Models
a) 16H+ 16bar+10+45x 4 +54 + 1x 4
b) 16H + 16barH=10+45+54 +1x 3
c) 16H+144H+16bar+144bar ....
Non-renormalizable operators for fermion fit.
Ad-hoc suppression of proton decay .
Susy GUTs
Charanjit S. Aulakh
Professor
Charanjit Singh Aulakh obtained an M.Sc from Delhi University in 1975 and a PhD from the
City University of New York in 1983. He has been a postdoctoral fellow at ICTP, Trieste and Niels
Bohr Institute, Copenhagen and a member of the faculty at IOP, Bhubaneshwar and the Physics
Department, Panjab University : where he served as Department Chair during 2010-2013. He
was appointed Adjunct Professor, IISER Mohali in 2008 and joined the institute in 2014.
Research Interests
Supersymmetric Grand unification, its Phenomenology and Cosmology,
Grand Unified Flavour unification, Grand Unification-Gravity links.
The two most compelling reasons for new theoretical structures beyond the
Standard Model (BSM) are neutrino masses (as seen in neutrino oscillations )
and gauge coupling convergence in the Minimal Supersymmetric Standard Model
at Grand Unified scales (10^{16} GeV). Supersymmetric (Susy) SO(10) GUTs are
the ideal, ample yet minimal, framework for models of BSM physics. They
exhibit deep links between Baryon and Lepton violation and have a host of
novel phenomenological and cosmological implications. Minimal SGUTs invoke
only the logic of SO(10) gauge symmetry without additional ad hoc
symmetries. The Susy SO(10) GUT based on the 210 + 126 + 126bar Higgs set
that we proposed in 1983 emerged as the minimal realistic and calculable
model of Grand Unification compatible with Seesaw mechanisms for neutrino
mass and gauged R-Parity. Our work thereafter used the completely soluble
symmetry breaking and mass spectra of MSGUTs to calculate threshold effects
at TeV and GUT scales and thereby find completely realistic fits of MSSM data
that predict novel Susy spectra. We anticipated(2008) the current Higgs
Discovery(2012) driven acceptance of large squark masses and soft Susy breaking
parameter (A0). We gave a novel resolution of the long standing problem of fast
proton decay in Susy GUTs based on wave function renormalization of MSSM
Higgs by superheavy particles. Susy Seesaw Inflation, Dynamical Yukawa
generation with gauged flavour, and GUT-Gravity connections are other novel
directions we are currently exploring in the context of the MSGUT.
Selected Recent Publications
•NMSGUT emergence and Trans-Unification RG flows, Charanjit S. Aulakh, Ila Garg,
Charanjit K. Khosa. arXiv:1509.00422 [hep-ph].
• Bajc-Melfo vacua enable Yukawon ultraminimal grand unified theories
Charanjit S. Aulakh, Phys.Rev. D91 (2015) 055012.
• Baryon stability on the Higgs dissolution edge: threshold corrections and
suppression of baryon violation in the NMSGUT, Charanjit S. Aulakh, Ila Garg,
Charanjit K. Khosa, Nucl.Phys. B882 (2014) 397-449.
• SO(10) grand unified theories with dynamical Yukawa couplings, Charanjit S.
Aulakh, Charanjit K. Khosa, Phys.Rev. D90 (2014) 4, 045008.
Cosmology
Prof. J. S. Bagla
Prof. J. S Bagla completed his PhD from IUCAA, Pune in 1996. He worked as a post-doctoral
research associate at the Institute of Astronomy, University of Cambridge for two years, and
then at the Harvard-Smithsonian Centre for Astrophysics for slightly over a year before joining
the Harish-Chandra Research Institute, Allahabad, as a faculty member in 1999. He joined
IISER Mohali in 2010.
Research Interests
I work on questions related formation of galaxies and large scale structure within the
framework of the standard cosmological model. It is believed that the large scale structure
forms due to gravitational collapse around over dense regions. This process amplifies tiny
fluctuations in density and leads to formation of highly over dense regions called halos.
Galaxies are believed to form when gas in halos cools and undergoes further collapse to form
stars.
The process of gravitational collapse in an expanding universe is fairly complex and we are
required to simulate this on super computers in order to follow relevant details. My
contribution in this field has been in development of highly optimized methods for doing
cosmological N-Body simulations. We have used these simulations to study the process of
gravitational clustering and demonstrate that this process erases differences between
different types of initial fluctuations. Suites of simulations have also been used to point out
deviations from certain strong assumptions
Computer simulations of galaxy formation allow us to develop strategies for observations that
require a large amount of time. We have used simulations to propose efficient ways to detect
galaxies using emission in the hyperfine transition of neutral Hydrogen at high redshifts.
Contrary to the received wisdom, we were able to demonstrate that direct detection may be
easier than a statistical detection of the large scale structure.
I also work on new probes of the high redshift universe. We have shown that the hyperfine
transition in singly ionized Helium-3 is a potential probe of the inter-galactic medium. Efforts
are underway to observe certain promising regions in the inter-galactic medium at high
redshifts.
Pictures in the top panel show a sequence where galaxy formation leads to reionization of the
inter-galactic medium. The colours show the fraction of gas in the form of singly ionized
Helium. Regions marked in red and orange have almost all the Helium in this form whereas in
the regions marked blue there is little singly ionized Helium: it is either in the neutral or fully
ionized form. These simulations are used to calculate the expected signal in the hyperfine
transition of Helium-3. This work is being done in collaboration with Dr. Benedetta Ciardi,
Dr. James Bolton and others.
Selected Recent Publications
• Yadav Jaswant, Bagla J. S. and Khandai Nishikanta, MNRAS 405, 2009 (2010).
• Bagla J. S., Khandai Nishikanta and Datta Kanan K., 2010, MNRAS 407, 567 (2010).
• Bagla J. S. and Prasad Jayanti 2006, MNRAS 370, 993 (2006).
• Bagla J. S., Journal of Astrophysics and Astronomy 23, 185 (2002).
• Bagla J. S., Jassal H. K. and Padmanabhan T. 2003, Phys.Rev.D 67, 063504 (2003).
Condensed Matter Theory : Soft and Biological
Matter
Dr. Abhishek Chaudhuri
Assistant Professor
Dr. A. Chaudhuri completed his PhD from S. N. Bose National Center for Basic Sciences India in
Soft Condensed Matter Physics. He has done postdocs at University of Oxford and University of
Sheffield, UK, Raman Research Institute and Indian Institute of Science, Bangalore, India. He
joined the institute in 2012.
Research Interests
The aim of our group is to understand the physical properties of biological and soft condensed
matter systems that are driven out of equilibrium. We use both analytical approaches (Equilibrium
and Non-equilibrium Statistical Mechanics, Hydrodynamics) and computational methods
(Molecular Dynamics, Brownian Dynamics, Monte Carlo) to investigate the dynamics of systems
ranging from the cell membrane and the cell cytoskeleton to polymers and colloids in
confinement. Currently the group has three PhD students and two MS students.
The cell is an active dynamical medium, constantly generating and dissipating energy to sustain the
various life processes. It is subject to active stresses arising from a meshwork of filaments (cell
cytoskeleton), which is driven out of equilibrium. In order to understand how this cytoskeleton
network comprising of the filaments, motor proteins and cross linkers, generate, transmit and
respond to mechanical stresses in both in vitro and in vivo situations, we are developing a
mesoscopic molecular dynamics scheme.
We use an active hydrodynamics approach for the coupled dynamics of these filaments and
the motor proteins to determine the organization of molecules on the cell surface. We study
the consequences of such organization on signalling platforms and the uptake of material by
the cell. We also study the response of cytoskeletal filaments to exteternal perturbations.
In soft condensed matter, our aim is to understand
the emergent properties of colloids and polymers in
confinement or otherwise, when they are subjected
to time dependent external drives.
Selected Publications
S. Chandel, A. Chaudhuri and S. Muhuri, EPL 110, 18002 (2015).
A. Chaudhuri, B. Bhattacharya, K. Gowrishankar, S. Mayor and M. Rao, PNAS 108, 14825 (2011).
A. Chaudhuri, G. Battaglia and R. Golestanian , Phys. Biol. 8, 046002 (2011) Selected as highlights of
2011 in Physical Biology.
J. Cohen, A. Chaudhuri and R. Golestanian, Phys. Rev. Lett. 107, 238102 (2011).
A. Chaudhuri, A. Kundu, D. Roy, A. Dhar, J. L. Lebowitz and H. Spohn, Phys. Rev. B. 81, 064301 (2010).
A. Chaudhuri, S. Sengupta and M. Rao, Phys. Rev. Lett. 95, 266103 (2005).
Soft Matter Physics
Dr. Dipanjan Chakraborty
Dr. Dipanjan Chakraborty completed his Ph.D from Indian Association for the Cultivation of
Sciences, Kolkata, India. He was an Alexander von Humboldt postdoctoral research fellow at the
University of Leipizig, Germany and a Max-Planck research fellow at the Max-Planck Institute
for Intelligent Sytems in Stuttgart.
Research Interests
The broad research interest of Dr. Chakraborty is in
the physics of soft matter and out of equilibrium
systems. The realm of soft matter comprises of a
multitude of systems with important technological
applications, with model examples ranging from
colloidal suspensions, polymer gels and solutions,
granular media to more complex systems of
biological matter. Soft matter systems are
characterised by the large length and time scales
(compared to microscopic lengths) and the thermal
fluctuations governing the dynamics of the
constituent macromolecules. A wide range of
collective phenomena, resulting in complex structure
and dynamics, emerge at such mesoscopic length
scales. He is also interested in out of equilibrium
systems, specifically in the problem of survival
probability in non-stationary processes.
Molecular dynamics simulation
snapshot of a heated colloidal
particle in a solvent.
Research in pictures: a collage of research interests of Dr. Chakraborty
Large Scale Simulations: Microscopic simulations of soft matter
and out of equilibrium systems provides a wealth of information as
to how macroscopic dynamics emerge from the microscopic degrees
of freedom. With the advent of powerful computing resources, such
large scale particle based simulations are becoming increasingly
popular. The research activities of Dipanjan strongly build on largescale coarse-grained simulations of soft matter systems, with a goal
to understand the rich physics at such mesoscopic length scales.
Selected Recent Publications
✦ Dipanjan Chakraborty and Debasish Chaudhuri, Physical Review E(Rapid Communications)
91, 05301(R) (2015).
✦ Olivier Bénichou, Anna Bodrova, Dipanjan Chakraborty, Pierre Illien, Adam Law, Carlos
Mejía-Monasterio, Gleb Oshanin and Raphaël Volituriez, Physical Review Letters,111,
260601 (2013).
✦ D. Chakraborty, Physical Review E 85, 051101 (2012).
✦ D. Rings, D. Chakraborty and K. Kroy, New Journal of Physics 14, 053012 (2012).
✦ D. Chakraborty, M. V. Gnann, D. Rings, J. Glaser, F. Otto, F. Cichos and K. Kroy, EPL
(Europhysics Lett.) 96(6), 60009 (2011).
✦ J. Glaser, D. Chakraborty, K. Kroy, I. Lauter,M. Degawa,N. Kirchgeßner, B. Hoffmann, R.
Merkel and M. Giesen., Physical Review Letters,105, 037801 (2010).
✦ D. Chakraborty, Phys. Rev. E 79, 031112 (2009).
NMR group
Dr. Kavita Dorai
Associate Professor
Dr Kavita Dorai is an experimental physicist working on nuclear magnetic resonance (NMR)
spectroscopy, whose research is poised at the interface of Physics and Biology. Her current
research interests include NMR Quantum Computing, NMR Metabolomics and Diffusion Studies
of Nanoparticles in Biomaterials using Gradient NMR. Dr Dorai obtained her PhD from IISc
Bangalore in 2000. After post-doctoral stints at Frankfurt University and Dortmund University
Germany and at Carnegie Mellon University Pittsburgh USA, she joined the faculty of IITMadras. She moved to IISER Mohali in August 2007 when the institute was established, and has
set up the NMR Research Facility.
NMR Research Facility: The Dorai group maintains the NMR Research Facility at IISER Mohali,
which currently houses two high-field FT-NMR spectrometers, 400 MHz and 600 MHz, both
from Bruker Biospin Switzerland.
Research Interests
NMR Quantum Computing : Quantum computers exploit the intrinsic quantum nature of
particles and have the power to solve computational problems intractable on any classical
computer. Our research in this area focuses on demonstrations of entanglement on an NMR
quantum computer and reconstruction of multi-party entanglement from two-qubit
tomographs, implementation of the quantum Fourier transform on qubit and hybrid qubitqutrit systems, protection of an entangled subspace using the quantum super-Zeno effect,
and construction of an ensemble witness operator on an NMR quantum information
processor.
NMR Metabolomics: Metabolomics is the new kid on the `omics' block and metabolites can be
used as biomarkers of environmental stress or change. Our research in this area focuses on
plant-pathogen interactions, plant-insect interactions, human diseases such as diabetes and
the impact of aging on immunity, using fruitflies, beetles and plant tissue as model systems.
(Note: Images to be used for NMR Metabolomics: metabolomics.eps,2d-hsqc.jpg).
Diffusion NMR: Diffusion NMR has wide-ranging applications in physics, biology and medicine.
Our research in this area focuses on the development of novel 2D and 3D DOSY-based diffusion
pulse sequences to separate individual components of a molecular mixture, to study the
diffusion of gold and silver nanoparticles inside biomembranes such as lipid bilayers, and to
model protein diffusion using a combination of pulsed-field gradient NMR experiments and
molecular dynamics simulations.
Current PhD students:
Shruti Dogra, Harpreet Singh, Navdeep Gogna,
Satnam Singh, Amandeep Singh,
Rakesh Sharma, Jyotsana Ojha
Former PhD students: Begam Elavarasi (now faculty at
Abdur Rahman University, TN India) Amrita Kumari
(now postdoc at Shanghai University, China)
M. Shukla (now postdoc at Glasgow University, Scotland)
Selected Recent Publications
• Navdeep Gogna, Neda Hamid and Kavita Dorai, J. Pharm. Biomed. Anal., 115, 74-85 (2015).
• Chris A. Brosey, Sarah E. Soss, Sonja Brooks, Chunli Yan, Ivaylo Ivanov, Kavita Dorai, Walter J.
Chazin, Structure, 23, 1028-1038 (2015).
• Shruti Dogra, Kavita Dorai, and Arvind Physical Review A, 91, 022312 (2015).
• Debmalya Das, Shruti Dogra, Kavita Dorai, and Arvind, Physical Review A, 92, 022307 (2015).
• Navdeep Gogna, K. Murahari, Anup Mammen Oommen and Kavita Dorai, Molecular
BioSystems, 11, 595-606 (2015). Selected as Hot Article in 2015 in Molecular BioSystems by RSC
publishing.
• Harpreet Singh, Arvind, and Kavita Dorai, Physical Review A, 90, 052329 (2014).
• Shruti Dogra, Arvind and Kavita Dorai, Phys. Lett. A, 378, 3452 (2014).
• Amrita Kumari and Kavita Dorai, J. Mol. Struct., 1041, 200 (2013).
• Matsyendranath Shukla and Kavita Dorai, Applied Magnetic Resonance, 43, 485 (2012).
General Relativity &
Cosmology
Dr. H. K. Jassal
Assist. Professor
Dr. H. K. Jassal completed her PhD from Delhi University. She was a postdoctoral fellow at
IUCAA Pune and HRI Allahabad. She joined the institute in 2011.
Research Interests
The observations in the last decade and a half have lead us to believe that the expansion of
our universe is getting faster. To explain this acceleration, we need an exotic form of matter
called the dark energy, the nature of which is unknown (The fractions of the components of
the universe are displayed in Fig. 1.). The dark energy component has negative pressure unlike
ordinary matter which is pressureless and radiation which has positive pressure. Many models
for Dark Energy have been proposed, including the cosmological constant. Observations at
present and the ones in the future are expected to throw light on nature of dark energy and in
general on the cosmological parameters.
The universe has only 4% of ordinary matter, the kind we are made of. The rest is composed
of largely unknown types of matter. About 24% of which is Dark Matter, which is pressureless
and interacts only via gravitational forces. The most dominant component of the universe is
the mysterious Dark Energy which drives the acceleration of the universe. I am interested in
using different observations to constrain cosmological parameters, in particular the dark
energy equation of state. The constraints on dark energy parameters using different
observations are shown in Fig. 2.
I am also working on implications of dark energy on structures in the universe if dark energy
itself actively contributes. In recent work, I have shown that taking dark energy perturbations
into account is important as these perturbations affect how normal matter perturbations
grow. In particular, the observable effect of these perturbations is in the Integrated Sachs
Wolfe effect, which is zero if the universe is composed only of nonrelativistic matter and in
presence of dark energy has a nonzero value. I show that there are significant differences in
the way structures form (see Fig. 3) for different models and future observations should be
able to rule out some of the many models of dark energy.
Selected Recent Publications
•
•
•
•
•
H. K. Jassal Phys. Rev. D 86, 043529 (2012).
H. K. Jassal, J. S. Bagla, T. Padmanabhan MNRAS 405, 2639 (2010).
H. K. Jassal Phys. Rev. D 81, 083513 (2010).
H. K. Jassal Phys. Rev. D 79, 127301 (2009).
H. K. Jassal Phys. Rev. D 78, 123504 (2008).
Quantum Thermodynamics
Dr. Ramandeep S. Johal
Associate Professor
Dr. Ramandeep Johal did his PhD in theoretical physics from Panjab University, Chandigarh. He
was Alexander von Humboldt fellow at Technical University of Dresden, Germany. He did a
second post-doc at University of Barcelona, Spain. He joined the institute in 2008.
Research Interests
The main research interests of the group are in the foundational issues in thermodynamics and
quantum theory. The connection between information-theoretic concepts and
thermodynamics is explored. The current interests include Quantum Thermodynamics and
different formulations of nonequilibrium thermodynamics. Some questions for reflection relate
to the nature of probability in physics and the use of Bayesian inference in physical theories.
The past research interests include deformed algebras, generalized statistical mechanics and
long-range interactions.
Quantum Thermodynamics: This rather novel area
refers to the interplay between thermodynamics
and quantum theory. It provides the theoretical
backbone to understand the functioning of miniature
thermal machines and information processing devies.
The techniques of quantum systems interacting with
thermal environments provide a useful tool. The
classical thermodynamic processes can be reformulated
for quantum media. We have studied quantum heat
cycles such as Otto cycle, and characterized its efficiency and work extraction. Cycles in finite
time are studied and effect of quantum interactions between the components of the system
are investigated. Dissipation and irreversibility are analysed with friction-like effects in the
quantum regime. Sometimes, we also conduct thought experiments using age-old models like
Szilard engine, exploiting Maxwell's demon to understand the role of information-theoretic
ideas in thermodynamic settings.
Maxwell’s Demon at work
Inference and physical theory: Inference may be regarded
as common-sense reasoning in the face of incomplete
information. The philosophical perspective central to this
investigation is that prior information can play useful role
to characterise uncertainty. Taking thermodynamics as the
substrate physical theory, we estimate the performance of
idealized heat engines with incomplete information, in
terms of their efficiency and obtained novel
correspondence with irreversible finite-time heat engines.
We seek to understand the interplay of
subjective/objective information in the formulation and
interpretation of physical theories, in general. Techniques
like maximum entropy principle, Bayesian statistics and
information-theoretic quantifiers play useful role.
Selected Recent Publications
G. Thomas and R.S. Johal, J. Phys. A: Math. Theor. 48, 335002 (2015).
R.S. Johal, R. Rai, and G. Mahler, Found. Phys. 45, 158 (2015).
P. Aneja and R. S. Johal, J. Phys. A: Math. Theor. 46, 365002 (2013).
G. Thomas and R. S. Johal, Phys. Rev. E 83, 031135 (2011).
100
G=1
(a)
10−1
10−5
10−4
10−3
10−2
10−1
G=3
()
100
100
10−5
10−4
10−3
ω
10−2
10−1
100
ω
0.6
32
32
64
128
0.4
64
3
128
256
256
512
512
Aloop /N δ
Aloop /N δ
G(ω)
0.2
2
1
G=1
(b)
G=3
(d)
0
0
π
2π
3π
ωN z
Statistical Mechanics
Soft Matter Physics
4π
5π
π
2π
3π
4π
5π
ωN z
Dr. Rajeev Kapri
Assistant Professor
Dr. Rajeev Kapri was a doctoral scholar at Institute of Physics Bhubaneswar and obtained
his Ph.D. in Physics from Homi Bhabha National Institute (HBNI) Mumbai, India. Before
joining the institute in 2009, he was a visiting fellow at Department of Theoretical Physics,
Tata Institute of Fundamental Research (TIFR) Mumbai.
Research Interests
His broad research interests are in developing simple models of complex biological processes
and study them by using tools of statistical physics like generating functions, exact transfer
matrix, Brownian dynamics and Monte Carlo simulations.
Dynamic transitions in DNA: The unzipping of a double-stranded DNA (dsDNA) is
carried out by enzymes that exert an external force on the strands of the DNA. When a
pulling force is applied on a dsDNA, the two strands unzip if the force exceeds a critical
value. Below the critical force the DNA is in the zipped phase while above it the DNA is in
the unzipped phase. We have studied the unzipping of a dsDNA whose ends are subjected
to a time dependent periodic force with frequency ω and amplitude G. We found that the
DNA can be taken dynamically from the zipped to an unzipped phase (or vice versa) either
by changing the frequency of the force at fixed amplitude, or by changing the amplitude of
the force at fixed frequency. In both the cases a hysteresis is observed. It was found that the
hysteresis loop area, which is a dynamical order parameter, shows different scaling at lower
and higher frequencies. In the high frequency regime, the loop area decreases monotonically
for lower force amplitudes but shows oscillatory behavior for higher force amplitudes (see
the top panel). We gave a simple analysis to obtain the frequencies at which the loop area
is extermum.
T = 1.0
160
120
<x>
<x>
160
200
(a)
80
40
200
(b)
T = 1.0
120
80
40
T = 1.0
120
80
40
∆t = 5000
∆t = 10000
0
∆t = 12000
0
0.4 0.5 0.6 0.7 0.8 0.9
(c)
160
<x>
200
1
0
0.4 0.5 0.6 0.7 0.8 0.9
g
1
0.4 0.5 0.6 0.7 0.8 0.9
g
1
g
Nonequilibrium work theorem : In the last decade many remarkable identities, known as
nonequilibrium work or fluctuation theorems, are developed that bridges the gap between the
nonequilibrium and equilibrium statistical mechanics. One of them is the Jarzynski equality,
which connects the thermodynamic free-energy differences between the two equilibrium states
and the irreversible work done in taking the system from one equilibrium state to a nonequilibrium state having the same external conditions as that of the other equilibrium state.
240
N = 128
T = 1.0
∆t = 1
200
160
<x>
Recently, we have developed a technique to extract
the equilibrium force versus separation isotherm for the
DNA unzipping problem by combining the multiple histogram method and the Jarzynski equality on repeated
non-equilibrium force measurements (top panel). We
found that this method is capable of reproducing the
equilibrium and the non-equilibrium force-separation
isotherms even for the spontaneous rezipping of a dsDNA (side panel).
gm = 0.725
120
80
Exact
g0 = 0.0
g0 = 0.2
g0 = 0.4
g0 = 0.6
40
0
0
0.2
0.4
0.6
0.8
1
g
Polymer translocation: We are exploring the polymer translocation through a functionalized pore using a particle-based mesoscale simulation technique for complex fluids known
as multi-particle collision dynamics (MPC) or stochastic rotation dynamics (SRD), which
incorporates the thermal fluctuations and the hydrodynamic interactions.
Selected Recent Publications
• Rajeev Kapri, Phys. Rev. E 90, 062719 (2014).
• Rajeev Kapri, Phys. Rev. E 86, 041906 (2012).
• K. P. Singh, Rajeev Kapri and S. Sinha, EPL 98, 60004 (2012).
• Rajeev Kapri, J. Chem. Phys. 130, 14510 (2009).
Correlated and Disordered
Electron Systems
Dr. Sanjeev Kumar
Asst. Prof. &
DST Ramanujan Fellow
([email protected])
Dr. S. Kumar completed his PhD from Harish-Chandra Research Institute, Allahabad,
India. He held post-doctoral positions at the University of Augsburg in Germany,
Leiden University in The Netherlands, and IFW Dresden in Germany before joining
IISER Mohali in 2010.
Research Interests
The research group is interested in the study of correlated and disordered quantum
systems using a combination of theoretical and computations methods. The specific
topics of current interest are, frustrated itinerant magnets, multiferroic materials and
disordered superconductors. One of the research themes is to search for
unconventional ordering of charge, spin and orbital degrees of freedom in materialspecific microscopic model Hamiltonians, and to study their consequences for
macroscopic physical properties of the relevant materials. Currently, the group has one
postdoctoral fellow, five PhD students and one MS students.
High-temperature multiferroicty in CuO:
In a recent work, we predict that cupric oxide
(CuO) under pressure can be a room-temperature
multiferroic with strong coupling between
magnetic and electric order parameters. The
study combines ab-initio DFT calculations, and
Monte Carlo simulations of the resulting magnetic
Hamiltonian. The ferroelectricity in this material
is driven by spin-spiral states. Our calculations
predict that under pressure , this material will
show room-temperature ferroelectric and
magnetic order with strong coupling between the
two order parameters.
Magneto-electric phase diagram of CuO
Selected pictures from publications highlighting research theme of the group
Frustrated iteinerant magnets: In recent studies we have
shown that the competition between ferromagnetic doubleexchange and antiferromagnetic superexchange on
geometrically frustrated lattices stabilizes exotic magnetic
order. For example, on a 2D checkerboard lattice we find
that magnetic moments organize in a way that introduces
fictitious magnetic fields for the electrons and leads to a
graphene-like electronic dispersion. We show that a
realization of the famous Haldane state in graphene is
realized in this system with electrons coupled to localized
magnetic moments.
Disordered superconductors: Often the most interesting
electronic properties, such as superconductivity, giant
magnetoresistance, anomalous Hall effect etc., appear upon
doping some parents material with electrons or holes. This
introduces disorder in the system arising from the random
locations of the dopant ions. Therefore, understanding the
effects of disorder on various long-range ordering phenomena
is a very important and active field of research. We have
recently studied the effect of site and bond disorder on swave superconductivity using Bogoliubov-deGennes selfconsistent approach, and we are continuing to study the
effect of other classes of disorder on superconductivity.
Magnetic flux phase on
checkerboard lattice
Distribution of pairing amplitudes
Selected Recent Publications
• S. Reja, R. Ray, J. v. d. Brink and S. Kumar, Phys. Rev. B 91, 140403(R) (2015).
•
•
•
•
K. Pasrija and S. Kumar, Phys. Rev. B 88, 188814 (2013).
X. Rocquefelte, K. Swartz, P. Blaha, S. Kumar and J. v. d. Brink, Nature Comm. 4, 2511 (2013)
J. Venderbos, M. Daghofer, J. v. d. Brink and S. Kumar, Phys. Rev. Lett. 109, 166405 (2012).
J. Venderbos, M. Daghofer, J. v. d. Brink and S. Kumar, Phys. Rev. Lett. 107, 076405 (2011).
Condensed Matter Physics
Dr. Goutam Sheet
Ramanujan Fellow
Dr. Goutam Sheet completed his PhD from Tata Institute of Fundamental Research, Mumbai in
condensed matter physics. He has done two postdocs at Northwestern university, Chicago, USA
and Argonne national Laboratory, Argonne, USA. He joined the institute in 2012.
Research Interests:
The principal research interest of the group is
the investigation of systems exhibiting novel
physical phenomena like superconductivity,
ferroelectricity,
ferromagnetism,
multiferroicity etc. using scanning probe
microscopy and transport spectroscopy at low
temperatures and high magnetic fields. In
superconductors, the interest is to study the
nature of the superconducting gap(s) by
point-contact spectroscopy and scanning
tunneling microscopy at low temperatures.
The group also investigates the physics of the
magnetic
vortices
in
unconventional
superconductors
by
magnetic
force
microscopy at low temperatures and in
magnetic fields. Using these techniques one
can also probe the ferromagnetic and
ferroelectric materials.
Ferroelectric Lithography on PZT using an
AFM tip
Particle ejection from a hard superconductor
due to pulsed laser irradiation
Plasma formed on the surface of copper
target during sputtering in the device lab
Human red blood cell imaged by AFM
The lab dedicates significant amount of time developing new measurement techniques. A state of
the art scanning tunneling microscope for low temperature and high magnetic field applications is
being designed and fabricated in house. The final design of the STM head is shown below:
Selected Recent Publications
• L. Fang, Y. Jia, C. Chaparro, G. Sheet, H. Claus, M. A. Kirk, A. E. Koshelev, U. Welp,
G. W. Crabtree, W. K. Kwok et al., Appl. Phys. Lett. 101, 012601 (2012).
• Goutam Sheet, Manan Mehta, D. A. Dikin, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom,
M. S. Rzchowski, C. B. Eom, and V. Chandrasekhar Phys. Rev. Lett. 105, 167003 (2010).
• Goutam Sheet, Alexandra R. Cunliffe, Erik J. Offerman, Chad M. Folkman, Chang-Beom Eom, and
Venkat Chandrasekhar, J. App. Phys. 107, 104309 (2010).
• Goutam Sheet and Pratap Raychaudhuri, Phys. Rev. Lett. 96, 259701 (2006).
Femtosecond Laser Lab
Dr. K. P. Singh
Ramanujan Fellow
Dr. K. P. Singh did his PhD from Univ. of Rennes1, France, in Laser Physics. He did two postdocs
at MPIPKS Dresden & JRM Lab. Kansas State University USA before joining IISER Mohali in 2009.
Research Interests
• Laser Science
• Attosecond Physics
• Femtosecond Nanoprocessing of materials
• Ultrasensitive optical techniques
• Biophotonics
Group Members
•
•
•
•
•
•
•
Dr. M. S. Sidhu (Postdoc)
Gopal Verma
(PhD)
Sumit Mishra
(PhD)
Pooja Munjal
(Int. PhD)
Anita Devi
(Int. PhD)
Biplob Nandi
(MS)
Gyanendra Yadav (MS)
Attosecond XUV setup: Attosecond laser set-up fully designed and developed at IISER Mohali.
White light filamentation
• Attosecond XUV pulses will be generated by focusing phase stabilized 2 mJ pulses@ 1 kHz rep rate.
• This unique setup will allow: as time-resolved spectroscopy, coherent control of matter & diffractive
imaging of nanometer scale structures and phenomena.
Twist-superelasticity and fatigueless of silk:
We unveiled torsional superelasticity and fatiguess
response of silk. This new physical property is due
to its unique molecular structure that allows
reversible molecular defirmation.
Optical nanoprocessing of spider silk with
femtosecond pulses: Using short femtosecond
laser pulses, we demonstrated a framework to
make nanoscale processing of silk. Integration of
silk with artificial materials towards realization of
novel heterostructures is also demonstrated.
Biophotonics: We exploited diffraction based
optical techniques to probe long-range
correlations and symmetry in the biophotonic
architecture of transparent insect wings.
Time-resolved Liquid drop interferometer
Nanometric bending of water with light : We demonstrated bending of fluid-fluid and air-fluid
interfaces by radiation pressure in total-internal reflection geometry. This sheds light onto nature of
photons momentum in medium that may find potential applications.
Photons momentum: on solids is also being investigated using new ultrasensitive approaches.
Selected Recent Publications
 Gopal Verma and K. P. Singh, Phys. Rev. Lett. Accepted (2015).
 Kamal P. Singh and Jan M. Rost, Phys Rev. A 91, 013415 (2015).
 P. Kumar et al., Laser Physics Letters 12, 025901 (2015).
 B. Kumar and Kamal P. Singh, Appl. Phys. Lett. 105, 213704 (2014).
 G. Verma and Kamal P. Singh, Appl. Phys. Lett. 104, 244106 (2014).
 A. Pradhan et al , Appl. Phys. Lett. 104, 063702 (2014).
 B. Kumar, A. Thakur, B. Panda & K. P. Singh, Appl. Phys. Lett. 103, 201910 (2013).
 G. Verma, J. Nair, Kamal P. Singh, Phys. Rev. Lett. 110, 079401 (2013).
 K. P. Singh, R. Kapri, Sudeshna Sinha, Euro Phys. Lett. 98, 60004 (2012).
 K. P. Singh and Sudeshna Sinha, Phys. Rev. E 83,046219 (2011).
Quantum Research Laboratory
Dr. Mandip Singh
Assist. Professor
Research Interests:
Quantum mechanics, quantum optics, Bose-Einstein condensation and general physics.
Quantum superposition principle is the heart of quantum mechanics. All quantum mechanical
processes, known at present, rely on quantum superposition principle. In the classical situation,
if a system is prepared in a given state (configuration) then it acquires only that state at a time.
For example, a stationary object can exist only at a single location in space and if we displace
this object to a new location then its existence from its previous location vanishes. This signifies
a classical reality which we observe everyday. In sharp contrast to the classical description of
reality the quantum mechanics defies such notions. The quantum superposition principle says, If
a quantum system can exist in one or the other state at a time then the same system can also
be prepared to exist in both the states at a same instance of time. Henceforth, the object can be
prepared to exist at two or more than two locations at a same instance of time. Superposition of
quantum states has been experimentally realized in various quantum systems consisting of few
photons, atoms, molecules, macromolecules and superconducting devices. Since every object
that we observe everyday is made of atoms and molecules then why do we not observe
macroscopic objects existing at two or more than two locations at a time. According to one
interpretation of quantum mechanics, as soon as one observes the quantum superposition of an
object the state of the object collapses to one of the superposed states. Therefore, if
unobserved, can one prepare a macroscopic object in a quantum superposition state. This is
one of my research direction where I am exploring the fundamental aspects of quantum
mechanics both theoretically and experimentally.
Theoretical work:
A flux-qubit-cantilever [1] consists of a flux qubit in the form of a cantilever as shown in Figure 1.
The mechanical deflection of the cantilever can be coupled to the net magnetic flux, passing
through the closed loop of the flux-qubit-cantilever, by applying an external magnetic field.
Under suitable baising conditions the ground state of the flux-qubit-cantilever corresponds to an
entangled quantum state of macroscopic observables. A particular case of the flux-qubitcantilever is a superconducting-loop-oscillator. The ground state of such an oscillator is a
quantum superposition state of distinct deflections.
!
dc-SQUID
#
"
Cantilever
%
B"
A
$
θ
Figure 1. Flux-qubit-cantilever [1]
Experiments:
The main component of research is focused on experiments based on Bose-Einstein
condensation. Laser cooling (magneto-optical-trap) of neutral atoms has been realized in an
ultra high vacuum environment where pressure is less than 7.5 x 10-12 Torr. An image of laser
cold atoms is shown in Figure-2. The temperature of the cold cloud is few hundred milli-kelvin.
The experiment is in progress towards realization of Bose-Einstein condensation. These
experiments are aiming to study quantum entanglement.
Figure 2. Magneto-optical-trap of neutral atoms.
References:
1. Macroscopic quantum oscillator based on a flux-qubit. Mandip Singh, Phys. Lett. A. 379,
2001-2006 (2015).
Na2Ir1-xRuxO3
OsB2
Dr. Yogesh Singh
Assistant Professor and
DST Ramanujan Fellow
Novel Materials Group
1 postdoc, 5 PhD’s, 1 MSc
Dr. Yogesh Singh completed his PhD from Tata Institute of Fundamental Research Mumbai. He did
postdoctaral work at Ames Lab, Iowa, USA (2005 – 2009) and at the University of Goettingen,
Germany as a Humboldt postdoctioral fellow (2009 – 2011) before joining IISER Mohali in 2011.
Research Interests:
• Single Crystal Growth of correlated materials
• Magnetically frustrated materials
• Quantum Spin systems
• Unconventional Superconductivity
• Topological Materials
Recent Highlights :
Robust Spin Liquid Behavior in the Hyper-Kagome Iridate Na4Ir3O8
•
•
•
•
Highly frustrated lattice of
corner sharing triangles
q= -650 K, no order T > 100 mK
Susceptibility and heat capacity
point to gapless excitations:
Spinon Fermi Surface!!
SL state robust against large
chemical perturbations
Kitaev Physics in the Layered Iridate Na2IrO3
Direct evidence of bond-dependent
(Kitaev) exchange interactions in Na2IrO3
Multi-gap Superconductivity in the layered Boride OsB2
•
•
•
Superconductivity below Tc = 2.1 K
Fermi-surface made up of one tubular and two
ellipsoidal sheets
Unusual Heat Capacity in magnetic field
Selected Recent Publications
• S. Yoon, S.-H. Baek, Ashiwini Balodhi, W.-J. Lee, K.-Y. Choi, Y. I. Watanabe, J. Lord, B. Buchner,
Yogesh Singh, and B. J. Suh, J. Phys. Cond. Mat., in press (2015)
• Ashiwini Balodhi, A. Thamizhavel, and Yogesh Singh, Phys. Rev. B 91, 224409 (2015).
• S. H. Chun, et al.. Nature Physics 11, 462 (2015)
• Yogesh Singh, Y. Tokiwa, J. Dong, and P. Gegenwart, Phys. Rev. B 88, 220413(R) (2013)
• S. K. Choi et al., Phys. Rev. Lett. 108, 127204 (2012).
• Yogesh Singh, S. Manni, J. Reuther, T. Berlijn, R. Thomale, W. Ku, S. Trebst, and P. Gegenwart ,
Phys. Rev. Lett. 108, 127203 (2012).
Cover Image: Chaos (Focus Issue on Intrinsic and Designed Computation:
Information Processing in Dynamical Systems) (2010)
Nonlinear Dynamics
&
Complex Systems
Sudeshna Sinha
FASc, FNA
Prof. Sudeshna Sinha completed her PhD from the Tata Institute of
Fundamental Research, Mumbai. She has been a member of the physics
faculty of the Indian Institute of Astrophysics, Bangalore (1994-1996) and
The Institute of Mathematical Sciences, Chennai (1996-2011). She joined
IISER Mohali in 2009.
Research Interests
Control of Chaotic Systems: This group is interested in strategies to
control the dynamical behaviour of complex systems. In particular we have
introduced the method of threshold control, and demonstrated its success in
simulations, such as for the case of neuronal spiking and smart matter
applications. We have also realized the idea in several experiments,
including most recently on time-delayed systems. We have also proposed
distributed adaptive schemes capable of stabilising complex spatio-temporal
patterns in extended systems. Lastly, we have also introduced adaptive
“anticontrol” schemes for enhancement and maintenance of chaos. This has
relevance in contexts where enhanced chaos leads to improved
performance, such as mixing flows in chemical reactions.
Synchronization of Complex Networks: We work on problems of
synchronization in a wide variety of dynamical networks, ranging from
epidemic spreading models to networks of neurons and coupled cell
pathways. Most recently, we have focused on investigating the influence of
dynamic and quenched random connections, on pattern formation in the
network.
Dynamics Based Computation: In recent years we have proposed the
novel concept of chaos computing. This paradigm has been realized in many
electronic circuit experiments, and forms the basis of a reconfigurable chip design,
which is expected to yield a dynamic computer architecture more flexible than the
current static framework. Currently, we are exploring this idea in a genetic ring
oscillator network with quorum sensing feedback
Interplay of noise and nonlinearity: The
constructive effect of of noise in enhancing
performance is a focus of recent work. For instance,
we find how noise is crucial to the emergence of
robust logic behaviour. This phenomena, called
Logical Stochastic Resonance, is studied in systems
ranging from nano-mechanical oscillators to
electronics circuits.
Simulation of complex networks
Work on Synthetic Gene Networks
as potential Flexible Parallel Logic
Gates:
Cover of Europhysics Letters
(2011)
Nano-Scale Mechanical and
Electronic Systems
@ Ultra-low Temperatures
Dr. Ananth Venkatesan
Ramanujan Fellow
Dr. Ananth Venkatesan completed his PhD in Physics from Northeastern University, Boston
working on 2-D electron systems. He did a Post-Doc un UBC, Canada followed by a Post-Doc at
the University of Nottingham, U.K.
Research Interests
We study mesoscopic devices like nano-electromechanical systems(NEMS) and 2-D electron
gas systems (2-DEGS) at ultra low temperatures. Out activities revolve around
i) A state of the are Ultra low temperature lab that can reach thermodynamic temperatures
~ 10 mK and
ii) A nano-scale Fabrication facility that includes tools like e-beam lithography, a plasma etch
system.
Currently, the lab. has two PhD students, two MS students and a Post-Doc who is joining us
shortly.
What is NEMS ?
Why Study NEMS @ low temp?
At T < 4.2 K almost everything except
Liquid helium freezes. Still a nano-scale beam Shows
a significant change in quality Factor with temp.
Shown below is the time domain Response
of ananoscale gold beam at 20 mK and 600 mK
A nanoscale guitar string?
A Super-conducting material
Sample fabricated at
University of Regensburg by the PI. We will
be able to make similar and even more complex
devices at IISER
A 5micron long
180 nm wide Au beam
Data by PI from NottinghamResponse of the beam@ 20 mK
& 600 mK
a
C
b
Image Gallery from the low temp lab a) Microwave waveguide circuits b)A Vacuum probe (c)The
workhorse of our lab a dilution fridge that reaches 10m K
It is interesting to note that mechanical propeties change significantly below 4.2K. In principle
NEMS Devices vibrate at high frequenices from RF to Microwave regime. The typical temperatures
of 10 mK we can reach in a dilution fridge (like the one if (c) of the gallery in the regime
hw >> KBT one can hope to see macroscopic quantum phenomena. In reality higher frequency
devices have low Q-factor making it difficult to measure anything sensible We try to understand the
low temperature quantum dissipation scenario and also engineer high –Q devices.
2-DEGS & other electronic systems:
6
5
250n
m
Width
g (e2/h)
4
A 250 nm wide
Split gate defines a
ballistic 1-D
Conductor on a 2-DEG
______ B = 0T
In 2-DEGS we are specifically
Interested in spin current transport
And also electronic correlations.
We are also interested in piezo
Electric behaviour to produce
Hybrid NEMS devices.
______ B =10T
3
2
T =200mK
1
-120
-100
-80
-60
-40
Gate voltage (mV)
The data shows quantized conductance and spin splitting in B fields.
Data by PI when at UBC
Selected Recent Publications
• K.J Lulla, R B Cousins, A Venkatesan, M J Patton, A D Armour, C J Mellor and
J R Owers-Bradley, New J. Phys. 14 113040 (2012 )
• A. Venkatesan, K. J. Lulla, M. J. Patton, A. D. Armour, C. J. Mellor, and J. R.
Owers-Bradley Phys. Rev. B 81, 073410 ( 2010) .
• S. M. Frolov, A. Venkatesan, W. Yu, J. A. Folk, and W. Wegscheider
Phys. Rev. Lett. 102, 116802 – ( 2009)
• S. Anissimova, A. Venkatesan, A. A. Shashkin, M. R. Sakr, S. V. Kravchenko,
and T. M. Klapwijk Phys. Rev. Lett. 96, 046409 ( 2006 )
String Theory
Dr. K. P. Yogendran
Assistant Professor
Dr. K. P. Yogendran completed his PhD from Tata Institute of Fundamental Research, Mumbai.
He has been a postdoctoral fellow at HRI, Allahabad, Cquest Korea and HIP Finlend. He joined
the institute in 2009.
Research Interests
In recent years, there has been a flurry of activities in applying ideas originating from string
theory to systems that involve strong interactions, implying that perturbative calculations often
give misleading results. My research has been focused on one system which exhibits
superfluidity due to the spontaneous breaking of a global symmetry. The current objective in
this program is to explore how gapped fermions make their appearance in these systems.
An enduring puzzle in quantum gravity has been to identify the degrees of freedom that
"constitute" a black hole. I am trying to build an analogy in a manner that will hopefully
enlarge the difference between a burning lump of coal and a black hole. An effective
analogy should capture the unitarity of the process of burning coal at the same time as
incorporating the salient features of black hole thermodynamics which might shed some
light on the information paradox in black hole physics.
A holographic dark soliton: The soliton seen in the lab is (roughly) the z=0 slice of this picture
In course of building the analogy, we are led to understand bound states as entangled states
of their multiparticle quantum constituents. We are therefore studying the hydrogen atom
from this perspective at varying levels of sophistication (as part of a student summer project)
which casts some light on the difference between bound and scattering states. A future
direction would be to explore the Kohn Sham theorems from the point of view of
entanglement entropy.
Selected Recent Publications
• P. Chingangbam, C. Park, K.P. Yogendran, Rien van de Weygaert, Astrophys. J. 755, 122 (2012).
• V. Keranen, E. Keski-Vakkuri, S. Nowling, K.P. Yogendran, New J.Phys. 13, 065003 (2011).
• V. Keranen, E. Keski-Vakkuri, S. Nowling, K. P. Yogendran Phys.Rev. D 81 126012 (2010) .
• V. Keranen, E. Keski-Vakkuri, S. Nowling, K. P. Yogendran, Phys.Rev. D 81, 126011 (2010).
• V. Keranen, E. Keski-Vakkuri, S. Nowling, K.P. Yogendran, Phys.Rev. D 80, 121901 (2009).
Physics Faculty by Research Area
Prof. Arvind
Prof. C. S. Aulakh
Prof. Bagla, Jasjeet
Quaqntum Information
Theoretical High Energy Physics
Cosmology
Dr. Chakraborty, Dipanjan Soft Matter Physics
Dr. Choudhary, Abhishek
Soft and Biological Matter
Dr. Dorai, Kavita
Nuclear Magnetic Resonance (NMR) Lab
Dr. Jassal, Harvinder
General Relativity and Cosmology
Dr. Johal, Ramandeep
Quantum Thermodynamics
Dr. Kapri, Rajeev
Statistical Mechanics and Soft Matter Physics
Dr. Sanjeev, Kumar
Correlated and Disordered Electron Systems
Prof. Mahajan, C. G.
Laser Physics
Dr. Manimala Maitra
Theoretical High Energy Physics
Dr. Sheet, Goutam
Condensed Matter Physics
Dr. Singh, Kamal
Femtosecond Laser Lab
Dr. Singh, Mandip
Bose Einstein Condensate (BEC) and Photons Lab
Dr. Singh, Yogesh
Novel Material Group
Prof. Sinha, Sudeshna
Nonlinear Dynamcis and Complex Systems
Dr. Venkatesan, Ananth
Dr. Yogendran, K. P.
Nanoscale Mechanical & Electronic systems at ultralow Temperature
String Theory
IISER Physics Faculty