DEPARTMENT OF PHYSICS IN-HOUSE SYMPOSIUM 2011 INDIAN INSTITUTE OF SCIENCE BANGALORE 560012 (NOVEMBER 26, 2011) FOREWORD As a periodic review of its activities, the Department of Physics has been organizing In-house Symposium on annual basis during recent years. This one-day symposium usually consists of oral presentations by faculty members, post-docs and students, and poster presentations by all those who would like to present their recent results. This is the first Inhouse Symposium in the New Physical sciences building. This year we have a total of 19 talks and 51 posters. I hope this package would be a reasonable representation of the ongoing research activities in the department. This event is also particularly useful to freshers to familiarize themselves with the current research activity in our Department in various branches of Physics. I would like to thank Prabal Maiti, Arindam Ghosh, Tarun Deep Saini, and Vijay Shenoy of our department who have shouldered the responsibility to organize this In-house Symposium. I urge all of you to actively participate in this important scientific activity. I hope you will all have an enjoyable and fruitful day. Prof. H. R. Krishnamurthy Chairman November 26, 2011 Department of Physics, IISc Bangalore In-house Symposium 2011 November 26, 2011 Auditorium, New Physical Sciences Building Programme Session I 9:00-10:30 Chair: H. R. Krishnamurthy T01 9:00-9:30 Sriram Ramaswamy Motile, shaken, stuck and relaxed T02 9:30-9:45 Aveek Bid Neutral modes in the fractional quantum hall regime T03 9:45-10:00 M. Haridas Optical properties of semiconducting QD- metal nanoparticle hybrid arrays T04 10:00-10:15 Mattaparthi Venkata Satish Kumar Structure of DNA-functionalized dendrimer nanoparticles T05 10:15-10:30 Anurag Misra Crystal structure of a peptide inhibitor of human islet amyloid polypeptide (hIAPP) fibrillization: Implications for the treatment of Type II diabetes 10:30-11:00 Tea Session II 11:00-01:00PM Chair: Tarun Deep Saini T06 11:00-11:15 K. P. Ramesh Ultra high field and temperature dependence of NMR T and charge transport studies in organic 1 conductor (PF - doped p3MT) 6 T07 11:15-11:30 Amal Medhi Synchronous and asynchronous Mott transitions in topological insulator ribbons T08 11:30-11:45 Vinod E. M. A composition dependence study on (GeTe)1-xSex chalcogenide alloys T09 11:45-12:00 V. S. Manu Use of genetic algorithm for quantum information processing by NMR T10 12:00-12:15 Bidya Binay Karak Modelling Maunder minimum using a dynamo model T11 12:15-12:30 Sayantan Majumder Discontinuous shear thickening in confined dilute carbon nanotube suspensions T12 12:30-12:45 Sakshath S A new magnetic memory concept based on ferromagnetic nanorings T13 12:45-1:00 Biswanath Chakraborty Phonon softening in top gated single layer MoS2 field effect transistor: in-situ Raman scattering and density functional theory 1:00-2:00 Lunch Session III 2:00-3:15 Poster Session Session IV 3:15-4:00 Chair: Prabal K. Maiti T14 3:15-3:30 Ambarish Ghosh Using light and sound to study electrons in Helium T15 3:30-3:45 Saroj Kumar Nandi Jamming and large deviations in micellar gels: a model T16 3:45-4:00 Nitin P. Lobo Adiabatic cross-polarization applied to solid state NMR experiments 4:00-4:30 High Tea Session V 4:30-5:30 Chair: Vijay B. Shenoy T17 4:30-4:45 Prateek Sharma Gas physics of galaxy clusters T18 4:45-5:00 Atindra Nath Pal 1/f noise as a probe to investigate the band structure of graphene T19 5:00-5:15 Mogurampelly Santosh Nucleic acid interaction with carbon nanotube and graphene Concluding Remarks, Best Poster Award 5:15-5:30 and Vote of Thanks List of Posters No. Presenter Title Mechanical properties of ZnS nanowires P01 Taraknath Mandal and thin films: Microscopic origin of the dependence on size and growth direction Solid state NMR Methodological P02 R. V. Sudheer Kumar Development for Structural Characterization Validity of Dynamical Density Functional P03 S. M. Kamil Theory Symmetry properties of Large-Deviation P04 Nitin Kumar Functions of the Velocity of a Self- Propelled Granular Rod Electroporation of cells with very short P05 Amit Kumar Majhi electric pulses Opto-electronic properties of graphene- P06 Medini Padmanabhan semiconductor hybrids Measurement of Electron Spin Lifetime and Optical Orientation Effeiciency in P07 Chinkhanlun Guite Germanium Using Electrical Detection of Radio Frequency Modulated Spin Polarization P08 Bidisha Nandy DNA compaction by dendrimer Over 100-fold increase in strain sensitivity P09 S. M. Mohanasundaram of a metal based piezoresistive MEMS transducer through nanoscale inhomogenization Fermionic Superfluid State in an Optical P10 Yogeshwar P. Saraswat Lattice via Band-Insulator to Superconductor Transition A 10 Tesla Table-top Controlled P11 Aditya N. Roy Choudhury Waveform Magnet Unconventional noise in two dimensional P12 Saquib Shamim doped Silicon Real Space Distribution of Ultra-cold Bosons in an Optical Lattice at a Finite P13 Manjari Gupta Temperature Using Strong Coupling Expansion Tuning between an antidot lattice and P14 M. A. Aamir quantum dot lattice in a double-gated GaAs/AlGaAs heterostructure Ultracold Fermions with Artificial P15 Jayantha P. Vyasanakere Rashba Spin-Orbit Coupling Heteronuclear Correlation between P16 Y. Jayasubba Reddy Carbon and Double Quantum Proton Chemical shifts in Solids P17 Semonti Bhattacharyya Topological Insulator: Basic concepts and preliminary results Trapped fermions in a synthetic non- P18 Sudeep K. Ghosh Abelian gauge field Microfluidic Devices For Measuring and P19 Siddharth Khare Exerting Micro-Newton Forces For Biological Applications P20 Subhamoy Ghatak Nature of Electronic States in Ultrathin MoS2 Field Effect Transistor Design of a polymer based Infra-red P21 Gurucharan V. Karnad sensor 1/f noise as a probe to investigate the P22 Vidya Kochat band structure and quantum interference in graphene P23 Tapan Chandra Adhyapak Active smectics Raman signatures of pressure induced P24 Achintya Bera electronic topological and structural transitions in Bi2Te3 DNA and Dendrimer assisted dispersion P25 Debabrata Pramanik of nanotubes Optical and Electrical Investigation of P26 Sandip Mondal CdTe Qds/PDDA Bistable Devices Fabrication of tunable potential barrier in P27 T Phanindra Sai Bilayer graphene P28 Vishal Maingi DBT: A versatile Dendrimer Building ToolKit Development of Methodologies in Ex-Situ P29 KowsalyaDevi Pavuluri NMR Spectroscopy Strongly correlated transport in ultrathin P30 Marsha M. Parmar gold nanowires Strongly magnetized cold electron P31 Upasana Das degenerate gas: Mass-radius relation of the collapsed star P32 Ananyo Maitra Membrane coupled to Active Fluid Temperature Dependent Sign Reversal of P33 K. S. Bhagyashree Magnetocrystalline Anisotropy in Nanoparticles of La0.875Sr0.125MnO3 Thermoelectric properties of PbTe with P34 Ashoka Bali Bi precipitates Evidence for shift of rigidity percolation P35 M. Prashantha to higher coordination numbers Topological Insulator on the Edge: P36 Amal Medhi Boundary Conditions Revisited Structural and magnetic transition in P37 Dona Cherian Fe1+yTe single crystals EPR Study of Electron-Hole Asymmetry P38 Geetanjali Singh in Bulk and Nanoparticles of Bi1- xCaxMnO3(x = 0.4, 0.6): A Comparison P39 Vaisakh V Multi Electron Bubbles in Liquid Helium Numerical studies of dynamo action in a P40 Naveen Jingade linear shear flow with turbulence P41 Himanshu Joshi Structure of DNA Nanotubes Exploration of the statistical properties of P42 Vishwanath Shukla Gross-Pitaevskii turbulence in two dimensions. Confinement Induced Density Modulation P43 Shibu Saw and Spatially Resolved Dynamics of Confined Liquids P44 Ruchika Yadav Structural and magnetic properties of Nd1-xYxMnO3 (0.1 ≤ x ≤ 0.6) Structure of Cytolysin A (ClyA) pore in P45 Swarna M Patra Lipid Bilayer Conversion between electromagnetically P46 Sapam Ranjita Chanu induced transparency and absorption in a degenerate lambda system Real-space manifestations of Energy- P47 Debarghya Banerjee spectra Bottlenecks: Insights from Hyperviscous Hydrodynamical Equations In-plane magnetic anisotropy in epitaxial P48 Sakshath S ultrathin Fe films Scroll-wave dynamics in human cardiac tissue: lessons from a mathematical model P49 Rupamanjari Majumder with inhomogeneities and fiber architecture Density functional studies of electrons P50 Pramod Kumar Verma and phonons in pyrochlores “Upper Branch” Fermi Gas and Tan's P51 Vijay B. Shenoy theorem TALK ABSTRACTS Motile, shaken, stuck and relaxed Sriram Ramaswamy I will give a quick summary of work done mainly with my students, concentrating on just-published or unpublished results. The topics: (i) active matter -- living organisms, their motorized components, and inanimate imitations in granular or colloidal matter; (ii) confined liquids and the glass transition; (iii) other current directions in brief: quantum thermalization, phase-transition models in ecology. Neutral modes in the fractional quantum hall regime Aveek Bid, N. Ofek, H. Inoue, M. Heiblum, D. Mahalu, V, Umansky and C. Kane Current propagates in the fractional quantum Hall effect (FQHE) regime along the edges of the two- dimensional-electron gas (2DEG) via chiral edge modes with a chirality dictated by the applied magnetic field. For some fractional states so called, holes-conjugate states), such as ½<vb<1 of the lowest Landau level, and in particular vb=2/3, early predictions suggested the presence of counter propagating edge modes, a downstream mode with the expected chirality, and an upstream mode with an opposite chirality. Since experiments did not find upstream propagating edge modes, Kane & Fisher suggested that in the presence of disorder and interactions edge reconstruction may take place with resultant charge modes accompanied by neutral modes - with the latter carrying only energy. In holes-conjugate fractional states the upstream modes are expected to be neutral, thus explaining why they were not detected thus far. Moreover, a neutral upstream Majorana mode is also expected for selected wavefunctions proposed for the even denominator state v=5/2. Here we report on the direct observation of upstream neutral modes in vb=2/3, vb=3/5, vb=5/3 & vb=5/2.