Iiser Roorke Physics

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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 Physical IISER Mohali 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 engage students students in in the exciteme excitement nt in in the world world of physic physics. s. Our Department provides a challenging, yet supportive environment, in which to pursue pursue resea researc rch h and teach teachin ing g goals goals,, and we have have stri strive ved d to creat createe an atmosphere atmosphere of collabor collaboratio ation n and collegial collegiality ity.. Researc Research h in this Department Department cover coverss incredibl incrediblee range, range, encompas encompassing sing phenomena phenomena spanning spanning length scales scales from nanometers to megaparsecs, and time scales from attoseconds to billions of years ears!! Ther Theree is grea greatt va vari riet etyy in the the Depar Departm tmen ent, t, and and we hous housee high high perf perfor orma manc ncee comput omputin ing g facil facilit itie iess and and many many stat statee-of of-t -thehe-ar artt rese resear arch ch laboratories. The The Depar Departm tmen entt has has been been propro-ac acti tivve in runn runnin ing g a su succcessf essful ul teac teachi hing ng progr program, am, and my colle colleagu agues es are are seekin seeking g bright bright and energ energeti eticc stude student ntss to further strengthen and sustain the activities of the research groups, through the Integr Integrat ated ed PhD, PhD, PhD and post-d post-doct octor oral al progr programs ams.. Member Memberss of this this Depa Depart rtme ment nt are are part part of nati nation onal al bodi bodies es,, su such ch Prog Progrramme amme Adv dviisory  sory  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, DST, DBT and CSIR. Hope Hope you enjoy enjoy this virt virtual ual walk through through our Departm Department! ent! Sudeshna Sinha 27 September 2013 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 engage students students in in the exciteme excitement nt in in the world world of physic physics. s. Our Department provides a challenging, yet supportive environment, in which to pursue pursue resea researc rch h and teach teachin ing g goals goals,, and we have have stri strive ved d to creat createe an atmosphere atmosphere of collabor collaboratio ation n and collegial collegiality ity.. Researc Research h in this Department Department cover coverss incredibl incrediblee range, range, encompas encompassing sing phenomena phenomena spanning spanning length scales scales from nanometers to megaparsecs, and time scales from attoseconds to billions of years ears!! Ther Theree is grea greatt va vari riet etyy in the the Depar Departm tmen ent, t, and and we hous housee high high perf perfor orma manc ncee comput omputin ing g facil facilit itie iess and and many many stat statee-of of-t -thehe-ar artt rese resear arch ch laboratories. The The Depar Departm tmen entt has has been been propro-ac acti tivve in runn runnin ing g a su succcessf essful ul teac teachi hing ng progr program, am, and my colle colleagu agues es are are seekin seeking g bright bright and energ energeti eticc stude student ntss to further strengthen and sustain the activities of the research groups, through the Integr Integrat ated ed PhD, PhD, PhD and post-d post-doct octor oral al progr programs ams.. Member Memberss of this this Depa Depart rtme ment nt are are part part of nati nation onal al bodi bodies es,, su such ch Prog Progrramme amme Adv dviisory  sory  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, DST, DBT and CSIR. Hope Hope you enjoy enjoy this virt virtual ual walk through through our Departm Department! ent! Sudeshna Sinha 27 September 2013 Quantum Information Dr. Arvind Professor  Arvind is a theoretical physicist whose research interests span the areas of quantum inf informa ormati tion on proc proces essi sing ng,, quan quantu tum m opti optics cs,, found ounda ation tionss of quan quantu tum m mech mechan anic icss and and rese resear arch ch in physics physics education. education. Research Interests Quantum Computing: Quantum computers when functional, are expected to qualitatively outperform outperform their classical counterparts. Characterising Characterising quantum entanglement and tracing tracing its exact role in quantum algorithms remains a challenging open problem. I have worked worked on issues related to quantum entanglement in the context context of the Deutsch-Jozsa algorithm and Parity Determining algorithm, quantum dissipation and its control, optical schemes for quantum computers computers and NMR implementations of quantum information processors. My current research interests in quantum information include characterisation characterisation of bound state entanglement, role of entanglement in quantum computation, quantum crytography crytography and physical implementations 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. 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 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). 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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 1'(0%#$ ., ' /"#5$,36 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 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. 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. Selected pictures highlighting research theme of the group 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 transport properties 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). 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 (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) 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). 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 • 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). Statistical Mechanics, Soft Matter Physics 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, Monte Carlo and molecular dynamics simulations. Pictures gallary from Femto-laser Lab 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. 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). !"##$%&'$( &*( +,-"#($#$( .%$/'#"* 01-'$2- +#3 0&*4$$5 672&#  !""#$ &'()$ * +,- ./0/123/1 4566(7 +'$ ,$ B20/' ;(0=65#5? ><" &>+ )'(0 C/'<">:@>/1?'/ .5"5/';> D1"E#2#5F !66/>/G/?F D1?56? =("#:?(;#('/6 '5"5/';> =("5 H15 M5#>5'6/1?"F /1? 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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 4     )     h     / 250n m Width    2 3    g 2    e     ( 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 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, N e w J . P h y s . 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 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 Dr. Yogendran, K. P.  Nanoscale Mechanical & Electronic systems at ultralow Temperature String Theory