Mode-resolved phonon scattering spectroscopy: Theory and experiments by Naveenath Krishanan

PROGRAM : FLUCTUATIONS IN NONEQUILIBRIUM SYSTEMS: THEORY AND APPLICATIONS

ORGANIZERS : Urna Basu and Anupam Kundu
DATE : 09 March 2020 to 19 March 2020
VENUE : Madhava Lecture Hall, ICTS, Bangalore

THIS PROGRAM HAS BEEN MODIFIED ONLY FOR LOCAL (BANGALORE) PARTICIPANTS DUE TO COVID-19 RISK

Recent decades have seen many significant developments in the area of nonequilibrium physics. Several general results have been found which apply to generic out of equilibrium systems appearing across various interdisciplinary fields. It is important to have a common platform to discuss both the pure developments of nonequilibrium theory and nonequilibrium phenomena observed in specific systems from an interdisciplinary perspective. This will facilitate further advancement in these directions. This program is organized keeping this goal in mind and will focus on the following three themes:

A) Fluctuation and response in nonequilibrium systems
B) Active systems: Theory and experiment
C) Applications in biological systems

These topics have been studied extensively over past decades and each of these fields has seen several key advancements, both theoretically and experimentally. For example, a generalized fluctuation-dissipation relation has been developed which provides a connection between nonequilibrium dynamical fluctuations and response to external perturbations. Active mater and processes occurring inside living cells are two fast evolving fields which deals with phenomena intrinsically far away from equilibrium. It is only natural to describe them in the framework of nonequilibrium fluctuation theory, which has not been explored much so far.

The principal aim of this program is to bring together leading experts in these interdisciplinary research areas and, foster interaction and collaborations. A secondary goal is to provide a learning experience for students, post-doctoral fellows and young researchers.

The program will have two mini-courses on each of the three themes. Each mini-course will in turn have three pedagogic lectures. In addition, there will also be a set of research seminars on related topics.
The program also includes Infosys-ICTS Chandrasekhar lecture series by Prof. Christopher Jarzynski (University of Maryland, USA).

Eligibility Criteria:
We invite applications from senior PhD students, postdocs and faculty who are working in areas related to the themes of the program.
(Advanced undergraduate and masters students will be considered in exceptional cases)

0:00:00 Mode-resolved phonon scattering spectroscopy: Theory and experiments
0:00:52 About me
0:01:14 Research focus
0:02:57 Heat conduction: A non-equilibrium transport process
0:03:52 Heat carriers in semiconductors
0:05:15 What are phonons?
0:07:42 From phonon's to thermal conductivity
0:10:18 First principles approach to calculate K
0:12:26 From thermal conductivity to phonon scattering
0:13:13 Diffusion causes ill-posedness
0:14:02 Solution: Non-diffusive heat conduction
0:17:19 Quasiballistic heat conduction: Real materials
0:24:12 Optically change "L": Transient grating
0:27:31 Surface scattering of phonon's in thin films
0:29:08 Phonon-averaged information in literature
0:31:08 Grating period-dependent thermal conductivity
0:32:16 First spectral measurement of phonon-surface scattering
0:33:19 Sensitivity to atomic-scale roughness
0:33:53 Summary