Ultrafast Optical and Low-frequency Spectroscopy of Semiconductor Nano-systems and Quantum Materials
- Online Seminar
- Date: Aug 18, 2020
- Time: 10:00
- Speaker: Jit Sarkar
- Indian Institute of Science Education and Research Kolkata
Subsequently a brief discussion upon our observation about the presence of trap-assisted auger recombination along with conventional Shockley-Reed-Hall type recombination in indirect bandgap semiconductor will be presented .The second half of the talk will deal with the ultrafast and THz spectroscopy study in topological insulator thin films. Observation of coherent excitation of different phonon modes upon ultrafast optical excitation in topological insulator thin films will be discussed . In the final section of the talk, I will show our preliminary results on THz conductivity of Pulsed Laser Deposition (PLD) grown topological insulator thin films. Granular nature of our PLD grown films yield non-Drude behaviour of optical conductivity and the same can be understood from the perspective of Drude-Smith model of ac conductivity of polycrystalline samples.
. Journal of Applied Physics, 124 (24), 243103.
. The Journal of Physical Chemistry C, 123 (15), 10007-10012.
. Applied Physics Letters, 106 (24), 241106.
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Meeting ID: 833 6749 4220