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I.Introduction:

        The department has major research programs in experimental condensed matter physics, nanoscience and technology, optical and laser physics, low temperature physics, statistical physics, biological physics, dynamical systems and chaos, quantum information theory, atomic and molecular physics, field theory and string theory, and has excellent facilities for these research programs. The department also undertakes a large number of sponsored and consultancy research projects.

        Physics department has a faculty strength of 35 with a wide range of research interests. The department also has state of the art facilities to pursue research in these areas. The names of the faculty, their research interests, representative publications and the research facilities available with each group are listed below. We also list the common facilities available.

A. Research Areas, Faculty, Facilities and Representative Publications:

1.Applied Optics
Ganesan, A. R., Kothiyal, M. P.
Applied Optics, Interferrometry, Optical instrumentation and testing, Adaptive Optics, Vision Science, Holography and Optical metrology.

Facilities: Optical fabrication workshop, Interferometers, Shack-Hartmann Wavefront Sensor and Holographic Systems.

(i). Spectrally resolved white -light phase -shifting interference microscopy for thickness -profile measurements of transparent thin -film layers on patterned substrates, S. K. Debnath, M. P. Kothiyal, J, Schmit, and P. Hariharan, Optics Express 14 (2006) 4662 -4667. (ii). Analysis of Refractive Errors in the eyes of Young Indians, M. Jesson and A.R. Ganesan, Journal of Modern Optics 54 7-9(2007) 1349-59.

 

2.Alternative Energy Technology
Ramaprabhu, S
Carbon Nanotubes, Hydrogen Energy and Fuel Cells, Energy related and biological/biomedical applications of various carbon based nanostructures.

Alloy hydride catalyst route of synthesis of single walled carbon nanotubes, multiwalled carbon nanotubes and magnetic metal nanowire encapsulated multi walled carbon nanotubes, A. Leela Mohana Reddy, M. M. Shaijumon and S. Ramaprabhu, Nanotechnology 17 (2006) 5299-5305.

Facilities: Alloy casting furnace, RF magnetron sputter thin film coating unit, Gas sensor test station, High energy planetary ball milling unit, Thermal and Automated catalytic CVD facility, Hydrogen pressure composition isotherm facility, Fuel cell test station and membrane electrode assembly, Electrochemical work station , Field emission set up, Thermal and electrical conductivity, Supercapacitor test cells, E-beam coating facility.

 

3. Atomic and Molecular Physics
Deshmukh, Pranawa C, Pattabiraman, M., Rangarajan, G., Vijayan, C.
Relativistic & Correlation Effects on Atomic Photoabsorption, Autoionization Resonance in Atoms/Ions, Photoionization Studies of Confined Atoms, Non-dipole Transitions at Low Photon Energies, Synchrotron Radiation Spectroscopy, Spin Polarization Parameters of Photoelectron, (e, 2e) Studies of Atoms and Molecules, molecular photo fragmentation, Saturation absorption spectroscopy of alkali atoms.

(i). Theoretical and experimental demonstration of the existence of quadrupole Cooper minima, P. C. Deshmukh, T. Banerjee , H. R. Varma, O. Hemmers, R. Guilllemin, D. Rolles, A. Wolska, S. W. Yu, D. W. Lindle, W.R. Johnson and S. T. Manson, J. Phys. B: At. Mol. & Opt. Phys.41(2008) 021002.
(ii). Correlation and relativistic effects on the photoionization of confined atoms, H. R. Varma, P. C. Deshmukh, V. K. Dolmatov and S. T. Manson, Phys. Rev. A 76, 012711 (2007).
(iii). Low Field Zeeman Magnetometry Using Rubidium Absorption Spectroscopy Nibedita Ram, M. Pattabiraman and C. Vijayan, J. Phys.: Conf. Ser. 80 (2007) 012035.

Facilities: Sunfire V210 Server with 4 GB RAM

 

4. Complex Fluids
Sunil Kumar, P. B.
Biological Physics, electrostatic effects in softmatter, equilibrium and far from equilibrium properties of lipid membranes, elasticity of cytoskeletal network, liquid crystals and surfactant solutions. The computational techniques include Dissipative Particle Dynamics, Brownian Dynamics, and Monte Carlo techniques. Experimental techniques include rheometry and light microscopy.

Self-propulsion of nematic drops: Novel phase separation dynamics in impurity doped nematogens, Snigdha Thakur, P.B. Sunil Kumar, N.V. Madhusudhana and Pramod A. Pullarkat, Phys.Rev.Lett 97(2006) 115701.

 

5. Low Temperature Physics
Nirmala, R., G, Sankaranarayanan, V., Santhosh, P. N., Sethupathi, K.
Properties at Low Temperatures, Superconductivity and Magnetism, SOFCs, Electroceramics, Structure-Property Relationships, Large magnetoresistive materials, Multiferroics, Magnetocaloric effect, Rare earth intermetallics.

Facilities: Nitrogen and Helium liquefiers, Closed cycle refrigerator, various bathtype and continuous flow cryostats, SQUID magnetometer, He3 cryostat with superconducting magnet, High temperature furnaces, Arc furnace, DC Magnetron sputtering unit.

(i). Complex ferromagnetic state and magnetocaloric effect in single-crystalline Nd0.7Sr0.3MnO3, R. Venkatesh , M. Pattabiraman, S. Angappane, G. Rangarajan, K. Sethupathi, Jessy Karatha, M. Fecioru-Morariu, R.M. Ghadimi and G. Guntherodt, Phys. Rev. B ,75 (2007) 224415.
(ii). Synthesis of single phase Ce doped nanocrystalline LaMnO3, C. Krishnamoorthy, K. Sethupathi and V. Sankaranarayanan, Materials Letters 61, Issues 14-15 (2007) 3254-3257.
(iii). Colossal magnetoresistance properties of Nd-doped Bi0.5Sr0.5MnO3, S. Savitha Pillai, G.Markandeyulu, P.N Santhosh, P. John Thomas, and F. Tuna, J. Appl. Phys, 103 (2007) 07F721.

 

6. Magnetic Resonance and Magnetic Materials
Harish Kumar, N., Murthy, V. S., Markandeyulu, G., Ramaprabhu, S.
Solid State Physics, Magnetic Resonance, Magnetism and Magnetic Materials, Superconductivity, Novel Magnetic Materials, Instrumentaion and automation, Hydrogen storage materials.

Facilities: Arc and Induction furnaces, Melt spinning facility to prepare metallic ribbons, Ball mill, DC and RF magnetron sputtering units, Vibrating sample magnetometer (12K - 300 K, up to 1.4 T), B-H loop tracer.

(i). Magnetocapacitance in Dy-doped Ni ferrite, K. Kamala Bharathi, K. Balamurugan, P. N. Santhosh, M. Pattabiraman and G. Markandeyulu, Phys. Rev. B, 77 (2008) 172401-172404.
(ii).. Giant magnetostriction in Sm{1-x}Nd{x}Fe{1.93} compounds, V.HariBabu, G.Markandeyulu and A. Subrahmanyam, Appl. Phys. Lett.,90 (2007) 252513.
(iii). Magnetoresistance studies on Ho0.85Tb0.15Fe2-xMnx, J. Arout Chelvane, G. Markandeyulu, N. Harish Kumar, R. Nirmala and S. K. Malik, Phys. Rev. B 72 (2005) 092406.

 

7. Microwave and Dielectrics
Murthy, V. R. K., Murugavel, P., Subramanian, V.
Microwave Physics, Dielectrics, Semiconductors, Microwave Hall Effect, Scanning Near Field Microwave Microscopy, Relaxor Ferroelectrics, Multiferroics and Multifunctional Materials.

Facilities: Various Microwave test benches, Microwave Vector Network Analyzers, Digital LCZ meter (0.04 - 200 KHz), 308 nm Excimer Laser Laser Ablation Unit, Digital Storage Oscilloscopes, Microwave Frequency Counter, Microprocessor controlled high temperature furnaces, Microwave sintering unit, Planetary ball mill, Glove box.

(i). Conformational and dielectric analysis of hydrogen bonded polar binary mixtures of propan-1-ol with isopropyl amine, T. Vishwam, M. Chitra, V. Subramanian and V. R. K. Murthy, J. Molecular Structure, 872, 93-98, 2008.
(ii). Microwave Hall Mobility Studies on Polymer-Metal oxide Nano Composites, D. V. B. Murthy, V. Subramanian, V. S. Pavan Kumar, T. S. Natarajan, G. K. Raghuraman, R. Dhamodharan and V. R. K. Murthy, J. Appl. Polym. Science, 107(2008) 1967-1972.

 

8. Nanomaterials and Nanostructures
Rao, M.S.R.
Electronic and magnetcis materials, thin films and bulk oxide electronics, magento trasport studies in manganites and spintronics.

Facilities: High temperature furnaces for bulk sample preparation, Pulsed laser deposition system, RF Magnetron sputtering, DC sputtering units, Closed cycle refrigerator, AC susceptometer, X-ray diffractometer, Hall measurement set up, Spectrophotometer, Impedance analyzer.

Observation of high permittivity in Ho substituted BaZr0.1Ti0.9O3 ceramics, S. Bhaskar Reddy, M. S. Ramachandra Rao, and K. Prasad Rao, Appl. Phys. Lett. 91, (2007) 022917

 

9. Nonlinear Optics
Vijayan, C.
Optical Processes and Materials such as semiconductor, Quantum dots (nanostructures), Porphyrins and dyes.

Facilities: Q-swicthed Nd:Yag laser (pulsewidth 9 ns; pulse energy 100mJ; rep rate 10 Hz), Dual channel lock-in amplifier.

Spectral and temporal evolutions of ultrashort pulses diffracted through a slit near phase singularities, Suhas Poyyil Veetil, Nirmal K. Viswanathan, C. Vijayan, and Frank Wyrowski, Appl. Phys. Lett. 89 (2006) 041119.

 

10. Polymer nano-fibers
Natarajan, T. S.
Applicatins of polymer nano-fibres in the areas of sensors, food packaging, filters and separation membrane, Electrospinning.

 

11. Semiconductor Physics
Jain, M. K., Subrahmanyam, A.
Semiconductor devices, Transparent Conducting Oxides, Photocatalysts for Bio-Medical applications, Electrochromics, Hard coatings, Plasmonics, Photovoltaics and Chemical Sensor.

Facilities: Three Target Sputter coater, vacuum coater, Electron beam evaporators, Pulsed laser Deposition System, CVD System, Kelvin Probe set up, Hall Effect, Ellipsometer, Filmetrics, Fluorospectrometer, spectrophotometer

(i). Results on the electrochromic and photocatalytic properties of vanadium doped tungsten oxide thin films prepared by reactive dc magnetron sputtering technique, K Muthu Karuppasamy and A Subrahmanyam J.Phys.D Applied Phys , 41 (2008) 035302.
(ii). Sol-gel derived TiO2:ZrO2 multilayer thin films for humidity sensing application, Kuyyadi P. Biju, and Mahaveer K. Jain Sensors and Actuators B: Chemical 128, (2008) 407-413.

 

12. Solid State Ionics
Hariharan, K
Solid State Ionics, Conducting polymers, Molecular Electronics and Instrumentation.

(i) Ionic transport studies on (PEO)6:NaPO3 polymer electrolyte plasticized with PEG400, Amrtha Bhide, K. Hariharan European Polymer Journal 43 (2007) 4253-4270.
(ii) Electrospinning of continuous aligned fibers, Bibekananda sundaray, V. Subramanian, T. S. Natarajan, Rong-Zeng Xiang, Chia-Cheng Chang and Wun-Shain Fann, Appl.Phys. Lett., 84 (2004) 1222-1224.

 

13. Theoretical Studies
Lakshminarayan, Arul
Quantum Entanglement and Spin Chains, Quantum Computation and Quantum Chaos, Extreme values Statistics in Quantum Eigenfunctions.

(i) Testing Statistical Bounds on Entanglement Using Quantum Chaos, \J. N. Bandyopadhyay, A. Lakshminarayan, Phys. Rev. Lett. 89 (2002) 060402.
(ii)Extreme Statistics of Complex Random and Quantum Chaotic States, A. Lakshminarayan, S. Tomsovic, O. Bohigas, S. Majumdar, Phys. Rev. Lett. 100 (2008) 044103

Balakrishnan, V, Lakshmi Bala, S
Classical and quantum dynamics, Quantum entanglement, Wavepacket dynamics, Chaos, Extreme value and recurrence statistics, non-equilibrium statistical mechanics.

(i) Wavepacket dynamics of entangled two-mode states, C. Sudheesh, S. Lakshmibala and V. Balakrishnan, J.Phys.B: At. Mol. Opt. Phys. 39 (2006) 3345-3359.
(ii) Probabilistic aspects of extreme events generated by periodic and quasiperiodic deterministic dynamics, G. Nicolis, V. Balakrishnan and C. Nicolis, Stochastics and Dynamics 8 (2008) 115-125.

Gupte, Neelima M
Dynamics of spatially extended systems, Transport in chaotic systems, Complex networks, Clustering algorithms: dynamical systems approaches.

The gradient mechanism in a communication network, S. Mukherjee and N.Gupte, Phys. Rev. E 77 (2008)036121.

Facilities: Apple Mac Xserve dual core 2 CPU Xeon 3 Ghz, HCL Infiniti dual core 4 CPU Xeon 3 Ghz, HCL Infiniti dual core 2 CPU Xeon 1.6 Ghz.

Narayanan, Rajesh
Condensed Matter Theory: Quantum Field Theories applied to condensed matter systems, Quantum Phase Transitions, and Strong disorder physics.
   Griffiths phase in the thermal quantum hall effect, A. Mildenberger, F. Evers, R. Narayanan, A.D. Mirlin and K.Damle, Phys. Rev. B 73 (2006) 121301(R).

Satyanarayana, M. V.
Quantum Optics, Photonics
Phase estimation, photon cloning and the Bernoulli map, S. Lakshmibala and M.V. Satyanarayana, Phys. Lett. A 298 (2002) 1.

Govindarajan Suresh, Tripathy Prasanta K.
Compactifications of string theory in the presence of fluxes, Black hole entropy and the attractor mechanism, Microscopic counting of BPS states in string theory and field theory, Aspects of the AdS-CFT correspondence for N=1 superconformal field theories and Ricci-Flat metrics.

(i). Symplectic potentials and resolved Ricci-flat ACG metrics, Aswin K. Balasubramanian, Suresh Govindarajan, Chethan N. Gowdigere, Classical and Quantum Gravity 24 (2007) 6393-6415 [arXiv:0707.4306] [hep-th].
(ii). On The Stability of Non-Supersymmetric Attractors in String Theory, Suresh Nampuri , Prasanta K. Tripathy , Sandip P. Trivedi JHEP 0708:054,2007. arXiv:0705.4554 [hep-th].

Simha Aditi
Nonequilibrium statistical physics; sedimenting suspensions, Hydrodynamics of matter. sheared complex fluids. Transition rates in driven steady states.

(1) Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles, Aditi Simha, and Sriram Ramaswamy, Phys. Rev. Lett., 89 (2002) 058101
(2) Properties of a nonequilibrium heat bath, Aditi Simha, R. M. L. Evans, A. Baule, Phys. Rev. E, 77 (2008).

 

12. Thin films
Damodara Das, V., Kasiviswanathan, S. ,Padhan, P.
Physics and Chemistry of Thin Films, Electron Microscopy, Semiconductor Physics, Cryogenics, Surface and Interface Studies of Semiconducting Thin Films, Vacuum Tunneling Spectroscopy, Surface Plasmon Resonance and SPR Microscopy, Magnetic Circular Dichroism, Digital Signal Processors for physical measurements.

(i). Synthesis and PIXE characterization of CuInSe2 and CuIn3Se5, P. Malar; Tapash Ranjan Rautray; V. Vijayan; S. Kasiviswanathan International Journal of PIXE 16 ( 2006) 127-136.
(ii). Determination of Nature of Principal Scattering Mechanism in well-annealed Vacuum Deposited Thin Films of Ternary Thermoelectric Material Bi2(Te0.8Se0.2)3, V.Damodara Das and Ramesh Chandra Mallik, Thin Solid Films 424 (2003) 75-78.

 

13. Ultrafast Lasers and Optical Amplifiers
Bisht, P. B., Satyanarayana, M. V.
Ultrafast laser optics and Microscopy (Cavity QED effects), Excitation energy transfer and Relaxation Processes, Fluorescence Upconversion, Supersonic Free Jet, Quantum optics, Laser Physics and Photonics.

Facilities: Picosecond and femtosecond lasers, confocal fluorescence microscope, time-correlated single photon counting technique for fluorescence lifetime measurements, four wave mixing and transient grating set ups, noncolinear optical parametric amplifiers and autocorrelators.

Sum and difference frequency generation of white light continuum with the ps pulses of Nd+3:YAG laser in a thick BBO crystal, A. Nautiyal, Prem B. Bisht, Optics Communications 278 (2007)175-179.

B Common Facilities: Powder X-ray Diffractometer, Raman Spectrometer, Differential Scanning Calorimetry, Spectrophotometer, Spectroflourimeter and a Department Computing Facility with Opteron and Xeon based servers and a large number of PCs, Inverted Microscope and EMCCD camera.

English