Date: 26th October, Thursday, 2023
Time & Venue: 5:30 PM, Ramanujan Hall
Speaker: Prof. Kamaraju Natarajan, IISER Kolkata
Title: Exploring Physics in Condensed Matter Systems Using Ultrafast and Terahertz Pulses
Abstract: Femtosecond pulses of visible, infrared, and terahertz electromagnetic radiation have been at the forefront of research in condensed matter physics and material physics since their inception. Their extensive use has facilitated the understanding of a multitude of intriguing physics phenomena, ranging from quasi-particle dynamics and many-body interaction physics to trapping dynamics, to name a few. In this talk, I will present some recent results that demonstrate the capabilities of ultrafast and terahertz pulses. The first part of the talk will explore trapping dynamics such as intrinsic trapping (including polarons and excitons) and extrinsic defects in several optoelectronic materials such as Fe2O3, V2O5, CoV2O6, CuS and MoSe2, using non-degenerate pump-probe transmission spectroscopy. In the second part of the talk, I will share some of our recent findings on using terahertz pulses to explore the fascinating world of topological insulators.
About the Speaker: Prof. N. Kamaraju received his PhD in March 2011 on ultrafast experimental condensed matter physics from the Department of Physics, IISc Bangalore. After his Ph.D., he worked in the field of terahertz physics at Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (for two years), and the Department of Electrical and Computer Science Engineering, RPI, Troy, NY, USA (for one year). Later he did his final postdoctoral research in Los Alamos National Labs, NM, USA on using THz to study two-dimensional systems under high magnetic fields (from Nov 2013-April 2016). He is now an associate professor in Dept of Physical Sciences, Indian Institute of Science Education and Research Kolkata, India (July 2016-).