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Khun Sang Phukon
12109065
Gravitational Wave Detection And Parameter Estimation
3rd June, 2014 (Tuesday)
4 pm
FB-382
There has been a worldwide effort to detect gravitational waves using ground based laser interferometer detectors. Inspiralling compact binaries in close orbits are the most promising and well-understood astrophysical sources of gravitational waves in the frequency band which may observable at these detectors. Gravitational waves will be detected by the method called match filtering, i.e, by correlating detectors output with a set a theoretical waveform templates. I will discuss the geometric formalism used to generate templates in the parameter space. Post detection accurate estimation of parameter is essential. For estimation of parameters and the associated errors, Fisher matrix based analysis can be followed. I will address effects corresponding to detector sensitivity, detector bandwidth and implications of higher order PN phasing corrections to template in parameter estimation.
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Pritam Kumar Roy
13109882
Harnessing Elastic Instabilities in Soft Matter
2nd June, 2014 (Monday)
4 pm
FB-382
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Suchita
12109876
Slow light: processes and applications
16 May 2014 (Friday)
11:30 pm
FB-382
Slow light is the propagation of light in a medium under reduced group velocity conditions. In earlier work, this has been studied in various media and structures. All these studies have one common feature, which is a sharp resonance peak, which leads to the modification of the group index and hence the group velocity. In this seminar, Stimulated Brillouin Scattering (SBS) based slow light is being presented. SBS, a nonlinear optical effect, is easily observed in optical fibers at very low input powers. SBS gain region gives the variation in refractive index of the medium and hence generates the slow light effect. SBS has both gain and loss regions depending upon the operating wavelength/frequency region which provides the positive as well as negative optical time delay. This property of SBS makes it more efficient than other sources of slow light generation in optical fibers. There are also certain limitations in SBS which requires a detailed study to improve the effect. Slow light has many potential applications in optical communication networks, quantum computing, information storage and ultrafast information processing.
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Tanmay Maji
12209874
Transverse momentum Dependent Parton Distribution functions
09 May, 2014 (Friday)
12:30 pm
FB-382
Transverse Momentum Dependent(TMD) parton densities are the 3-dimensional generalizations of the standard Parton Distribution functions (PDFs). Many recent experiments on Semi-Inclusive Deep Inelastic Scattering (SIDIS) and Drell-Yan processes suggest that the collinear picture of fast moving hadrons is not sufficient and one equires to investigate the hadronic structure involving partons with transverse momentum distributions. The TMDs are function of lightcone momentum fraction, square of momentum transferred and the intrinsic transverse momentum of the parton. In leading twist, there are eight altogether eight TMD PDFs. Calculation of TMDs from first principle in QCD requires nonperturbative techniques. Till now, TMDs are generally evaluated in different models. In this talk, I'll discuss some recent theoretical results of TMDs. Our future plan is to investigate the TMDs using LightFront Wave Function Formalism as well as in AdS/QCD.
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Kamalika Nath
12109872
Investigation of magnetic properties and their configurations in low dimensional magnetic structures
25 April, 2014 (Friday)
5:30 pm
FB-382
The talk will present an overview of recent results on the behaviour of magnetism in low-dimensional magnetic structures. Typical results related to different magnetic configurations in nano-structures,competition between different energy scales like magneto-crystalline and shape anisotropy and their effect on different quantities,viz., the coercive field, saturation fields, shape of hysteresis loops etc. in these nano-structures will be discussed. Some results relating to the manipulation of domain walls,domain wall pinning and experimental techniques used in these investigations, will be reviewed. Some results on developing low dimensional magnetic structures and studying their properties developed in the lab will also be presented in the seminar.
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Shailendra Kumar Rathor
12109874
Fluid Instabilities and Long-term Evolution of Intracluster Medium
25th April, 2014 (Friday)
12 pm
FB-382
In the past two decades, instabilities in intracluster medium (ICM) permeating every galaxy cluster has become a topic of active research in astrophysics. The presence of a weak magnetic field in ICM changes the dynamical stability of the system dramatically. In this talk, ICM will be modeled as a thermally stratified weakly-collisional plasma layer. The curious role of the anisotropy due to weak magnetic field on the heat flux in ICM will be highlighted. Such an anisotropy is responsible for introducing some interesting instabilities e.g magnetothermal instability (MTI), and heat-flux driven buoyancy instability (HBI). It will be seen that further consideration of anisotropy in pressure tensor has unignorable effects. We shall also discuss the dynamical stability of dilute plasma in the light of simultaneous presence of the thermal and the compositional stratifications. Finally, I shall elaborate on my immediate and long-term plans towards the successful completion my intended Ph.D. work.
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Mr. Anmol Thakur
12109063
Transport and many body effects in Low dimensional systems
10th April, 2014 (Thursday)
11 am
FB-382
We study the low energy collective modes for 2D systems with spin-orbit coupling.The electric transport and spin dynamics in such systems is related by an operator identity at lower energies.The identity relates the electric current to in-plane spin degree of freedom, which in the presence of electron electron interactions leads to an undamped spin plasmon mode whose dispersion is similar to that of a sound mode. We study the spin plasmon mode, in the presence of both - short ranged and long ranged interaction. We next want to explore the effect of static disorder on such modes.
In addition, we have also studied the transport phenomena in low dimensional system using Landeur-Buttilker formulae and Non Equilibrium Green's function approach which is now a most commonly used tool in the transport study of nano-dimensional MOSFETS and other devices. We plan to apply such techniques to study transport properties of hybrid superconducting systems in the future.
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Mr. Raghawendra Kumar
12109067
Controlling light using optical nano-antennas
9th April, 2014 (Wednesday)
4 pm
FB-3872
Confinement of light to small volumes is of great importance for many applications ranging from solar concentrators, fluorescent enhancements, subdiffraction imaging etc. Nano-antennas provide a convenient way to manipulate light and enhance a range of linear and nonlinear phenomena. Nano-antennas can create intense, localized field distributions or enable coupling to highly subwavelength objects, which is generally not possible by optical components such as mirrors, lenses and gratings. In this seminar, I will give a basic introduction of optical nano antanna, and how it is used to concentrate light into sub-diffraction volumes. I will also describe a two-photon polymerization technique to fabricate 3D micro and nanostructures, which will be used to fabricate nano-antennas . I will focus on the enhancement and coupling of fluorescence from single molecules using these antennas.
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Anil Kumar Singh
12109062
Local electronic properties of graphene
9th April, 2014 (Wednesday)
3 pm
FB-382
Graphene, a single layer of graphite, has raised extensive interest in a wide scientific community for its extraordinary thermal, mechanical, electrical and other properties. In particular, due to its high mobility graphene has been considered as a candidate material for applications in post-silicon electronics. In this seminar, I shall discuss some of the experiments probing the local and bulk electronic properties of graphene and the factors affecting these properties. In particular, the effect of back-gate, disorder, proximity to different materials (such as normal metal, superconductor), chemical dopants will be reviewed. I shall also present our plan on investigating the local electronic properties of graphene using scanning tunneling microscopy and spectroscopy.
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Shamik Ghosh
12109875
Beyond the Cosmological Principle
31st March, 2014 (Monday)
11 am
FB-382
Cosmological Principle is the fundamental assumption of homogeneity and isotropy of space in the Standard Model of Cosmology. In the talk I will first discuss the Cosmological Principle and justify its importance towards building the Standard Model of Cosmology. I will briefly discuss the Standard Model and explain its success before proceeding to show the persistent anomalies when fitting experimental data. These anomalies require us to check the validity of the Cosmological Principle. I will then present various partially successful attempts to explain the anomalies observed in the data. These include local scale modification of observables due to secondary effects, phenomenological models and inflationary models.
Finally I will discuss some work that I have done in this field and the possible avenues that can be taken towards understanding the phenomena and building an appropriate model.
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Ritu Gupta
12109068
Proximity effect at Ferromagnet-Superconductor interface
7th March, 2014 (Friday)
12 pm
FB - 382
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Dipanwita Ghanti
12109871
Collective force generation by microtubules and molecular motors.
5th March, 2014
4 pm
FB - 382
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Anshuman Dey
11109063
AdS/CFT correspondence and a Generalized Holographic Superconductor with Higher Derivative Couplings.
5th March, 2014
3 pm
FB -382
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Biplab Dutta
11109862
Anisotropy in Turbulent Flows
19th February, 2014 (Wednesday)
12 pm
FB - 382
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Alestin Mawrie
12109061
Novel phenomena in spin-orbit coupled fermionic systems.
21st February, 2014
11 am
FB -382
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Pavan Kumar
11209067
Microtubule polymerization kinetics: effects of structure and energetics.
29 November, 2013 (Friday)
12 pm
FB - 382
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Abhishek Juyal
11209061
Electrical manipulation and detection of domain walls in nanomagnets
15th November, 2013
10 am
FB - 382
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Vinay Kumar Shukla
11209068
Interfaces: An alternative route to magnetoelectricity
15th November, 2013
9 am
FB-382
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Vijay Singh
Y10209067
Investigation of Electric and Magnetic Properties of Compositionally Modulated Gallium Ferrite.
12 November, 2013
5 pm
FB-382
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Alekha Chandra Nayak
11209062
ELKO fermions
8 November 2013 (Friday)
12 pm
FB-382
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Dipak Rout
11209064
Light-matter interaction in dielectric and metallo-dielectric photonic crystals.
18th October, 2014
10 am
FB - 382
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