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Physical Sciences
IISER Mohali
Soft Matter Physics
Novel Materials Lab
Quantum Thermodynamics
Femto-Laser Lab
Nonlinear Dynamics& Complex Systems
Cosmology
Laser Physics
BEC and Photons Lab
String Theory
NMR Lab
Statistical Physics
Correlated & DisorderedElectron Systems
Ultra-Low Temperature Lab
Condensed Matter Physics
Quantum Computing
Biophysics
General Relativity
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The Department of Physical Sciences has witnessed exciting growth in a
short period of six 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 high
performance computing facilities and many state-of-the-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, such Programme Advisory
Committees of DST and the National Board of Higher Mathematics, 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!
Sudeshna Sinha27 September 2013
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Quantum Information Dr. ArvindProfessor
Research Interests
Quantum Computing: Quantum computers whenfunctional, 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 implementationsof 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.
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.
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Selected Recent Publications
• Ritabrata Sengupta and Arvind, Phys. Rev. A, 87, 012318, (2012).
• Ritabrata Sengupta and Arvind, Phys. Rev. A, 84, 032328, (2011).
• Geetu Narang and Arvind. Phys. Rev. A 75, 032305, (2007).
• Arvind, Gurpreet Kaur and Geetu Narang, J. Opt. Soc. Am. B, 24, 221 (2007).
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 non-
classical 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 aredesigned 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.
Phd students and postdocs working in my group: Ritabrata Sengupta, Debmalya Das, Shruti
Dogra (jointly with Dr Dorai), Harpreet Singh (jointly with Dr Dorai), Dr Roman Sverdlov
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Cosmology Prof. J. S. Bagla
Research Interests
I work on questions related formation of galaxies and large scale structure within theframework 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 doingcosmological 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
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.
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Research InterestsThe 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
method (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 one PhD student, two MS students and one BS
student.
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.
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. 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.
Soft and Biological MatterDr. Abhishek Chaudhuri
Assistant Professor
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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.
We are also interested in studying transportproperties in general. More specifically we have
been studying the problem of heat transport using
non-equilibrium simulations and direct numerical
evaluations of current given in terms of phonon
Green's function.
Selected Publications
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).
J. Cohen, A. Chaudhuri and R. Golestanian, Phys. Rev. Lett. 107, 238102 (2011).
A. Chaudhuri et al , Phys. Rev. B. 81, 064301 (2010).
A. Chaudhuri , S. Sengupta and M. Rao, Phys. Rev. Lett. 95, 266103 (2005).
Selected pictures highlighting research theme of the group
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NMR group Dr. Kavita Dorai Associate Professor
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 qubit-
qutrit 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).
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, bothfrom Bruker Biospin Switzerland.
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 IIT-
Madras. She moved to IISER Mohali in August 2007 when the institute was established, and has
set up the NMR Research Facility.
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Selected Recent Publications
• M. Nimbalkar, R. Zeier, J. L. Neves, S. Begam Elavarasi, H. Yuan, N. Khaneja, Kavita Dorai and
S. J. Glaser, Phys. Rev. A 85, 012325 (2012).
• Matsyendranath Shukla and Kavita Dorai, Magn. Reson. Chem. 50, 341 (2012).
• Matsyendranath Shukla and Kavita Dorai, J. Magn. Reson. 213, 69 (2011).
• Amrita Kumari and Kavita Dorai, J. Phys. Chem. A 115, 6543 (2011).
• S. Begam Elavarasi and Kavita Dorai , Chem. Phys. Lett. 489, 248 (2010).
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 (jointly with Prof. Arvind)
Harpreet Singh (jointly with Prof. Arvind)
Navdeep Gogna (jointly with Dr Prasad)
Satnam Singh
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)
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General Relativity &
CosmologyDr. H. K. Jassal
Assist. Professor
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.
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.
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.
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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).
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.
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Quantum Thermodynamics Dr. Ramandeep S. Johal Associate Professor
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 relateto 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.
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.
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Selected Recent Publications
• P. Aneja and R. S. Johal, J. Phys. A: Math. Theor . 46, 365002 (2013). (2013).
• G. Thomas and R. S. Johal, Phys. Rev. E 83, 031135 (2012)
• G. Thomas and R. S. Johal, Phys. Rev. E 82, 061113 (2010).
• R. S. Johal, A.E. Allahverdyan and G. Mahler , Phys. Rev. E 77, 041118 (2008).
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 obtainednovel 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.
Maxwell’s Demon at work
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Statistical Mechanics,
Soft Matter PhysicsDr. Rajeev Kapri
Assistant Professor
Research Interests
His broad research interests are in developing simple models of complex biological processesand study them by using tools of statistical physics like generating functions, exact transfer
matrix, Brownian Dynamics, Monte Carlo and molecular dynamics simulations.
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.
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Selected Recent Publications
•Rajeev Kapri, Phys. Rev. E 86, 041906 (2012).
• K. P. Singh, Rajeev Kapri and S. Sinha, Euro Phys. Lett 98, 60004 (2012).
• Rajeev Kapri and D. Dhar, Phys. Rev. E 80, 1051118 (2009).
• Rajeev Kapri, J. Chem. Phys. 130, 14510 (2009).
His recent interests are in exploring: (i) the surface-polymer interaction via external forcing of
the polymer, (ii) the behavior of particles or fluids on a fluctuating membrane, (iii) hysteresis in
DNA, and, (iv) the behavior of polymer in a confined environment.
Pictures gallary from Femto-laser Lab
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Selected Recent Publications
• X. Rocquefelte, K. Schwarz, P. Blaha, S. Kumar and J. v. d. Brink, Nature Comm. (in press).
• 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).• G. Giovannetti, S. Kumar et al., Phys. Rev. Lett. 106 , 026401 (2011).
• S. Kumar
and J. v. d. Brink, Phys. Rev. Lett. 105, 216405, (2010).
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Condensed Matter Physics Dr. Goutam SheetRamanujan Fellow
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 themagnetic 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
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.
Particle ejection from a hard superconductor
due to pulsed laser irradiation
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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).
Plasma formed on the surface of copper
arget during sputtering in the device lab
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:
Human red blood cell imaged by AFM
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Femto-Laser Laboratory Dr. K. P. SinghRamanujan Fellow
Research Interests
The lab houses a state-of-the art femtosecond laser system that produces intense ultra-short IR
pulses with 2mJ energy per pulse at 1 kHz repitition rate. These pulses can be further
compressed to produce phase-stabilized few cycle sub 7fs laser pulses. We study applications
of these pulses in laser-matter interaction, attosecond physics, pump-probe measurements
and in biology. Current PhD students: Bhupesh Kumar, Gopal Verma, Postdoc: Dr. P. Kumar.
Attosecond Physics: We are working to setup an
Attosecond beam line to produce attosecond
XUV pulses of light (1as=10-18s) using high
harmonic generation (HHG). Application of
these coherent XUV pulses for pump-probe
experiments are envisioned. Besides, thecoherent control of electron dynamics is
Theoretically studies by numerically solving
TDSE.
Ultrafast optics: Interaction of fs-pulses with
various materials is an active research
area. We are studying various phenomenon
like time-resolved abalation, nonlinear optics
using intense pulses.
White light filamentation by fs-pulse
Dr. K. P. Singh completed his PhD from University of Rennes1, France in laser Physics. He has
done two postdocs at Max Planck Institute Dresden and JRM Lab. Kansas State University, USA.
He joined the institute in 2009.
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Selected Recent Publications
• Gopal Verma, James Nair, Kamal P. Singh, Phys. Rev. Lett. 110, 079401 (2013).
• Kamal P. Singh, R. Kapri, Sudeshna Sinha, Euro Phys. Lett. 98, 60004 (2012).
• Kamal P. Singh and Sudeshna Sinha, Phys. Rev. E 83,046219 (2011).
• A. Kenfack and Kamal P. Singh, Phys. Rev. E 82, 046224 (2010).
• Kamal P. Singh et al , Phys. Rev. Lett. 104, 023001, (2010).
Biophotonics and Biophysics: Applications of the
femtosecond and CW lasers to study biological systemsare explored. We have exploited diffraction based optical
techniques to probe long-range correlations in the
biophotonic architecture of transparent insect wings and
spider silk systems. The interaction of ultrashort laser
pulses to precision abalation biological materials is also
considered.
Pictures from Femto-laser Lab
Diffraction by twisted spider silk
Bending fluid-interfaces with light: Recently, we
demonstrated bending of fluid-fluid and air-fluid
interfaces by radiation pressure in total-internal
reflection geometry. This sheds light onto nature of
light-interface phenomenon that may find potential
applications.
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Quantum Research Laboratory
Bose Einstein Condensation & PhotonsDr. Mandip Singh Assist. Professor
Research InterestsQuantum mechanics is a broad subject that explains how photons, atoms, molecules and
subatomic particles work. Modern day technology is based on practical implications of quantum
mechanics. From foundational point of view quantum superposition and entanglement are
counterintuitive aspects of the microscopic world. According to quantum superposition
principle, a particle can be present at more than a one location at a given instant of time.
Entanglement can be considered as a superposition in which constituents can be separated.
When two entangled particles are separated in space their entanglement remains intact. A
measurement performed on the state of one particle results an immediate influence on the
state of other particle – a phenomenon known as nonlocality in quantum mechanics. Quantum
mechanics allows quantum superposition of macroscopic objects and even of living matter as
argued by Schrodinger through a cat paradox. However, no macroscopic object has observed yet
to be present at more than a one place at a given instant of time. Concept of reality, observation
in quantum mechanics and implication of quantum mechanics at macroscopic level are thetopics which are not yet completely explained.
To explore fundamental features of quantum mechanics the realization of two laboratories is in
progress. Equipped with edge cutting research technology the labs will explore the quantum
world through experiments based on Bose Einstein condensation and photons.
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Extended cavity diode lasers of line width 100 kHz and mode hop free tuning range
50 GHz for laser cooling of neutral atoms.
Bose Einstein condensation experiment: Bose Einstein condensation occurs when
wave packets of individual bosonic atoms overlap as a result atoms in the condensed state
are governed by a single macroscopic wavefunction. Critical condition for Bose Einstein
condensation implies atomic wavepackets must be overlapped in momentum space as well
as in real space simultaneously.Bose Einstein condensation experiment consists of an ultrahigh vacuum chamber where
condensate will be produced in a magnetic trap. Extended cavity diode lasers will cool atoms
to a mK temperature range in a magneto optical trap, Further cooling below Doppler limit
will be realized through a polarization gradient cooling. Polarization gradient cooling will
produce a temperature of about 40 µK. Critical temperature which is of the order of 0.1µK
will be realized through an evaporative cooling using a radio frequency pulse. Bose Einstein
condensate will be observed through a technique called absorption imaging where a
resonant laser pulse is incident on a free falling condensate and scattered light from the
condensate is imaged with a lens on an EMCCD camera. Those atoms which are notcondensed expand faster during free fall while a Bose Einstein condensate expands much
slower and anisotropically during free fall. Anisotropic expansion of cold atoms is a signature
of Bose Einstein condensate. Temperature of ultracold atoms is calculated from rate of
expansion of atomic cloud during free fall.
Physics Education: Teaching physics through demonstration experiments, symmetries,
analogies, geometry and simplification of a complex phenomenon to root principles are the
key concepts in physics education. Integration of engineering & technology with advanced
experimental techniques of physics is an essential component for research innovations. In
this context, a paper resulting from work on physics education has been communicated to a journal.
Selected Recent Publications:
• J. Kofler, M Singh, M. Ebner, M. Keller, M. Kotyrba & A. Zeilinger, Phys. Rev. A 86, 032115 (2012).
• Mandip Singh, Optics Express. 17 , 2600 (2009).
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Selected Recent Publications• BM .)',-)++/$J NM (&-$3*J OM I#8J NM PM B#&&J QM R/A#$J B$ ,D1;C 5# /6$J
J4K,1 7$#1 G$L1 SSTJ TUVWTX GXTSYLM
• @M (/5#$J .M I'<*J RM I84C)//ZJ [DBM [18J (M \''$+,)-J NM @/+'$ J
B$ ,D1;C 5# /6 MM J4K,1 7$#1 G$L1 ST]J XVVWTV GXTSXLM
• "M (1/#J @M (/&4'-J ^M E/&5/%/)/<J _M I-$3-+,')J `M 6-A#$J "M R&8$4'&J PM
@-4-'&&# J B$ ,D1;C 5# /6$J J4K,1 7$#1 G$L1 NOPJ SXUXTW GXTSXLM
• B$ ,D1;C 5# /6$M J4K,1 7$#1 G$LM STaJ SXUXTY GXTSXLM
•
OM I#8J _M R')&#b$J ?MD.M c#$J ?M E8J ^M _+<'&#ZJ cDN E#5J BM .)',-)++/$J B$,D1;C 5# /6$J J4K,1 7$#1 Q aYJ XXTWTY GXTSSLM
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• 5./$*8"6E.8?#+)K R$%"S T8 U <1N V
• @$*I+D,.*F(8$ I(E$ ./ "F "6$
).R.%(* (6E )S" $%%+/,"+E(% ,4$$),
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Nonlinear Dynamics &
Complex SystemsDr. Sudeshna SinhaFellow, Indian Academy of Science
Control of Chaotic Systems: This group is interested in strategies to control the dynamicalbehaviour 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.
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
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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.
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
Space time simulation of complex dynamical networks
Work on Synthetic Gene Networks as potential
Flexible Parallel Logic Gates: Cover of
Europhysics Letters (2011)
Current PhD students: Vivek Kohar, Anshul Choudhary
and Ankit Kumar. Postdoc: Soma De
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Nano-Scale Mechanical and
Electronic Systems
@ Ultra-low Temperatures
Dr. Ananth VenkatesanRamanujan Fellow
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.
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.
What is NEMS ?
nanoscale guitar string?
Super-conducting material
mple fabricated at
iversity of Regensburg by the PI. We will
able to make similar and even more complex
vices at IISER
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 5micron long180 nm wide Au beam
Data by PI from NottinghamResponse of the beam@ 20
& 600 mK
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6
5
4
3
2
1
-120 -100 -80 -60 -40
Gate voltage (mV)
g (
e 2 / h )
______ B = 0T
______ B =10T
T =200mK
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 )
mage 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
b C
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 temperaturesof 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:
250n
m
Width
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.
A 250 nm wide
Split gate defines a
ballistic 1-D
Conductor on a 2-DEG
The data shows quantized conductance and spin splitting in B fields.
Data by PI when at UBC
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String TheoryDr. K. P. Yogendran
Assistant Professor
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 somelight on the information paradox in black hole physics.
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.
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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).
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.
A holographic dark soliton: The soliton seen in the lab is (roughly) the z=0 slice of this picture
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Prof. Arvind Quaqntum Information
Prof. Bagla, Jasjeet 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. 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 Nanoscale Mechanical & Electronic systems at ultralow Temperatur
Dr. Yogendran, K. P. String Theory
Physics Faculty by Research Area