02-01-2012 At 04:00:00 PM
Speaker: Prof. A.Abbas, Aligarh Muslim University
Category: General Seminar
Venue: Lecture Hall
20-01-2012 At 04:00:00 PM
Speaker: Sai Vinjanampathy, University of Massachusetts Boston
Category: TPSC Seminar
Venue: Lecture Hall
Green sulfur bacteria are a kind of bacteria that are present in lakes and near deep-sea thermal vents. The Fenna-Matthews-Olson (FMO) complex is a molecular complex that is central to the transfer of light trapped by a light-harvesting antenna to the interior of the cell for photosynthetic activity. There has been some experimental work suggesting that the transfer of excitations across the FMO complex is mediated by quantum correlations. We will investigate quantum correlations in such complexes with a focus on measures of entanglement and other correlations.
25-01-2012 At 04:00:00 PM
Speaker: Kuntala Bhattacharjee
Category: Cancel Notice of General Seminar today at 4.00ation
Venue: Lecture Hall
Self-organized growth of surface supported nano-structures like atomic nanowires are likely to play important role in future electronic devices where the confined electrons show quantization phenomena. The formation and growth behavior of epitaxial atomic nanowires of 3d, 4d and 5d elements on a corrugated molecular Cu3N network on a Cu(110) surface have been reported. An element independent growth of nanowires consisting of 5 atomic rows (~ 1 nm in width) running along [1-10] direction on Cu3N-Cu(110) surface was observed [1]. The charge density of Cu(110) surface can be dramatically altered by terminating the surface with a (2x3) copper nitride (Cu3N) layer. A proper understanding of the local electronic properties of the corrugated Cu3N-Cu(110) molecular network and the atomic nanowires grown on this surface would be fundamentally important. We report here the low temperature (4.7 K) scanning tunneling spectroscopy (LT-STS) studies of both the Cu3N layer and the Cu, Fe & Au atomic nanowires grown at room temperature on this surface. Constant height and constant current spectroscopy measurements have been carried out on the Cu3N network and on the atomic nanowires. LT-STS studies on the Cu3N surface show three unoccupied electronic states at 2.0 V, 3.4 V and 4.0 V and two occupied electronic states at -5.6 V and -8.0 V. These results are qualitatively understood as various hybridized N 2p Cu 3d states [2]. Tunneling spectroscopy measurements performed on the atomic nanowires of Cu, Fe & Au show appearance of two pronounced unoccupied electronic states at ~ 1.8 V and ~ 3.8 V. These observations will be discussed in view of the electronic structure of the Cu/Fe/Au-Cu3N-Cu(110) system.[1] X.-D. Ma, D. I. Bazhanov, O. Fruchart, F.Yildiz, T.Yokoyama, M.Przybylski, V.Stepanyuk, W. Hergert and J.Kirschner. PRL 102, 205503 (2009)[2] K. Bhattacharjee, X. –D. Ma, Y. Zhang, M. Przybylski and J. Kirschner, accepted Surf. Sci., doi: 10.1016/j.susc. 2011.12.002
25-01-2012 At 11:00:00 AM
Speaker: Dr. Debaprasad Maity,(LeCosPA, National Taiwan University, Taiwan)
Category: HEP / CMP Seminar
Venue: Lecture Hall
01-02-2012 At 04:00:00 PM
Speaker: Dr.T.N. Sairam, IGCAR, Kalpakkam
Category: Experimental Group Seminar
Venue: Lecture Hall
02-02-2012 At 04:00:00 PM
Speaker: Prof. Andres Reyes Lega, Universidad de Los Andes Bogota, Columbia
Category: TPSC Seminar of General Interest
Venue: Lecture Hall
In this talk I will describe two examples of application of topology tophysics. The first one refers to attempts to understand the spin-statisticsconnection in the non-relativistic context. This naturally leads to theconsideration of quantum mechanics on topologically non-trivialconfigurations spaces. The second one has to do with the possibility ofrelating certain topological invariants to quantum systems that present aquantum phase transition. In particular I will show how, in the case of theanisotropic XY-model, it is possible to actually compute these invariantsand relate their dependence on the external field to the quantum phasetransition.
06-02-2012 At 04:00:00 PM
Speaker: Prof. Subhendra Mohanty, PRL, Ahmedabad
Category: Colloquium
Venue: Lecture Hall
08-02-2012 At 04:00:00 PM
Speaker: Prof. Subhendra Mohanty, PRL, Ahmedabad
Category: Colloquium
Venue: Lecture Hall
09-02-2012 At 04:00:00 PM
Speaker: S. Triambak, Department of Physics & Astrophysics University of Delhi, Delhi
Category: General Seminar
Venue: Lecture Hall
In this talk I will present some recent results from precision nuclear physics experiments using both stable and radioactive ion beam facilities. A part of this talk will focus on isospin symmetry breaking in A = 32 nuclei and its relationship to fundamental tests of the Standard Model.
09-02-2012 At 11:30:00 AM
Speaker: Prof. Subhendra Mohanty, PRL, Ahmedabad
Category: General Seminar
Venue: Lecture Hall
A survey of various theoretical models will be givenwhich can explain the possible observations ofsuperluminal neutrinos at OPERA.
10-02-2012 At 04:00:00 PM
Speaker: Dr.Kuntala Bhattacharjee
Category: General Seminar
Venue: Lecture Hall
13-02-2012 At 11:00:00 AM
Speaker: Dr. Sourin Das (Delhi University)
Category: Condensed Matter Theory Seminar
Venue: Lecture Hall
Recent experimental developments in detection and manipulationof quantum hall states with quasi-particles excitations followingnon-abelian statistics have raised hopes for building topologicalprotected quantum bits which form fundamental units of a topologicalquantum computer. I will first discuss recent experimental attempts todetect the non-abelain nature of the u = 5/2 quantum hallstate. Then I will talk about our theoretical proposal for detection ofneutral modes which exist at the boundary of the u = 5/2 quantum hallstate which is believed to be a direct reflections of the existenceof non-abelain quasi particle in the bulk. For detecting a neutral mode itis natural to look for thermal response rather then electrical response.But measuring thermal response in a controlled way is a formidable task inreal life experiments. I will discuss a setup, which can get around thisproblem by using a quantum point contacts in series follows by a shotnoisemeasurement. I will also discuss some very recent theoretical andexperimental developments which involve the use of a quantumdot as a thermoelectric probe for neutral modes.
15-02-2012 At 04:00:00 PM
Speaker: Satyajit Sahu, National Institute for Materials Science, Advanced Nano Characterization Unit,Tsukuba
Category: General Seminar
Venue: Lecture Hall
Exploring protein with only one resonating circuit had restricted its application within the domain of chemical self-assembly. We find that the secondary structures of proteins build multiple resonating circuits, for tubulin, seven circuits resonantly vibrate to synchronize ~40000 tubulins instantly even under non-coherent pumping. Radio-wave induced synchrony is so robust that it turns tubulin's condensation reaction 200000 times faster by arranging them in cylindrical shape even before the reaction begins. The momentary burst of laser-like signal during condensation depicts a phase and frequency locked synchrony that enables microtubule to exhibit identical electronic properties for any length. When molecules that evolve different species are pumped with tubulin, condensation fuses them to those seven regions; new properties are added, keeping fundamental properties intact. This shades light on the programming of nature's complex evolution, provides tool to atomically engineer synchrony for rapid production of new generation materials and instantly test newly designed drugs.
27-02-2012 At 04:00:00 PM
Speaker: Prof. Jayanta Bhatacharjee, SN Bose Centre
Category: Colloquium
Venue: Lecture Hall
28-02-2012 At 04:00:00 PM
Speaker: Binata Panda
Category: HEP Seminar
Venue: Lecture Hall
03-03-2012 At 04:00:00 PM
Speaker: Prof. Ignatios Antoniadis, CERN
Category: Colloquium
Venue: Lecture Hall
06-03-2012 At 04:00:00 PM
Speaker: Dr. Tapan Nayak, VECC, Kolkata
Category: General Seminar
Venue: Lecture Hall
On November 8, 2010 the Large Hadron Collider (LHC) at CERN collided first stable beams of heavy ions (Pb on Pb) at center-of-mass energy of 2.76 TeV/nucleon. The LHC worked exceedingly well during its one month of operation with heavy ions, delivering about 10 microbarn-inverse of data, with peak luminosity reaching to towards the end of the run. Three experiments, ALICE, ATLAS and CMS, recorded their first heavy ion data, which were analyzed in a record time. The results of the multiplicity, flow, fluctuations, and Bose-Einstein correlations indicate that the fireball formed in nuclear collisions at the LHC is hotter, lives longer, and expands to a larger size at freeze-out as compared to lower energies. We give an overview of these as well as new results on quarkonia and heavy flavour suppression, and jet energy loss.
12-03-2012 At 04:00:00 PM
Speaker: Dr. Kuntala Bhattacharjee
Category: General Seminar
Venue: Lecture Hall
16-03-2012 At 04:00:00 PM
Speaker: Mr. Souvik Banerjee
Category: HEP Seminar
Venue: Lecture Hall
19-03-2012 At 04:00:00 PM
Speaker: Prof. Abhijit Bhattacharya, Department of Physics, University of Calcutta
Category: TPSC Seminar of General Interest
Venue: Lecture Hall
23-03-2012 At 04:00:00 PM
Speaker: Prof. J. Maharana, IOP
Category: HEP Seminar
Venue: Lecture Hall
08-05-2012 At 04:00:00 PM
Speaker: Dr. P. Balasubramanian Department of Physics, Tamkang University, Taiwan.
Category: General Seminar
Venue: Lecture Hall
10-05-2012 At 11:30:00 AM
Speaker: Dr. Sayan Chakrabarti, (Centra, Lisbon)
Category: HEP Seminar
Venue: Lecture Hall
14-05-2012 At 04:00:00 PM
Speaker: Prof. L. Satpathy, IOP
Category: Colloquium
Venue: Lecture Hall
Mass of the nucleus plays decissive role in all nuclear phenomena like stability, decay, reaction with other nuclei, and abundances of various elements in nature originating from nucleosynthesis in stellar evolution. Therefore mass formula has occupied the centre stage of nuclear physics research since early days. Historically, the first model of nucleus is the celebrated Bethe Weizsacker Mass Formule proposed in mid 1930s soon after the discovery of nucleus. This talk will delibrate on the physics foundation and the status of various mass formulae developed so for in nuclear physics. It will also specifically focus on the Infinite Nuclear Matter mass formula developed in IOP over the years.
18-05-2012 At 04:00:00 PM
Speaker: Dr P. K. Muduli University of Leipzig, Germany
Category: Exp.Physics Seminar
Venue: Lecture Hall
Mesoscopic spintronic devices rely on injection, transport and detection of electron spin degree of freedom to provide functionality in addition to the charge of the electron. However, spin injection into a semiconductor suffer from the problem of conductivity mismatch. One of the interesting aspects of tunneling through an insulator sandwiched between two ferromagnets is that, the spin of the electron is conserved. Therefore, tunneling through an insulator can be used for spin injection into semiconductor without conductivity mismatch problem. Besides the spin polarization of electrodes, tunneling also depends on the type and quality of tunnel barrier. I will speak about magnetotransport properties of few-layer graphene and show how the quality of tunnel barrier can affect spin injection into few-layer graphene.
28-05-2012 At 04:00:00 PM
Speaker: Prof. S. Uma Sankar, IIT, Mumbai
Category: Colloquium
Venue: Lecture Hall
Neutrinos have occupied the center stage in particle physics for the past three decades. Naturally produced neutrinos from the sun, the atmosphere and Super Nova 1987 have provided many surprising results. These, I turn, led to the design of precision neutrino experiments with man made sources. For the past decade, such experiments have produced a wealth of data which have solved some of the problems but opened up others. I will review the recent developments and discuss what we can except in the next decade.
01-06-2012 At 04:00:00 PM
Speaker: Prof. S. Uma Shankar,
Category: HEP Seminar
Venue: Lecture Hall
06-07-2012 At 04:00:00 PM
Speaker: Tanumoy Mandal, IMSc Chennai
Category: THEP Seminar
Venue: Lecture Hall
09-08-2012 At 04:00:00 PM
Speaker: Dr. Sajal Kumar Ghosh, Post doctoral fellow, Department of Physics, University of California ,San Di
Category: General Seminar
Venue: Lecture Hall
Amphiphilic molecules are made up of two parts of opposing nature: one is a hydrophilic part referred to as the ‘head’ group and other is a hydrophobic ‘tail’ group. The non-polar tail part is usually a long hydrocarbon chain which is covalently attached to the polar head group. Depending on physicochemical properties, they form self-assembled structures of various shapes which are highly appreciated in soft matter industry. Interesting liquid crystalline phases observed at low water content in these systems will be discussed along with their possible routeof phase transition. A class of biomolecules also belongs to this group. The talk will include a synchrotron x-ray scattering study of model bio-membrane and its interaction with ions. The study provides unprecedented structural insights into the interaction and promises the physicists to provide high resolution structural details of membrane-macromolecule interaction. The future research with these molecules will also be presented.
27-08-2012 At 04:00:00 PM
Speaker: Niraj Kumar (UCSD, USA)
Category: Condensed Matter Theory Seminar
Venue: Lecture Hall