University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, April 6th 2018
12:20 pm:
Speaker: Tianbai Cui, University of Minnesota
Subject: Impact of damping on superconducting gap oscillations induced by Terahertz pulses

We investigate the interplay between gap oscillations and damping in the dynamics of superconductors taken out of equilibrium by strong optical pulses with sub-gap Terahertz frequencies. A semi-phenomenological formalism is developed in which damping is incorporated by relaxation and dephasing processes within the electronic subsystem, which correspond to T1 and T2 times in the standard pseudospin language for BCS superconductors. Comparing with data on NbN that we report here, we argue that the superconducting dynamics in the picosecond time scale, after the pump is turned off, is governed by the T2 process.

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