Impact of damping on the superconducting gap dynamics induced by intense terahertz pulses

Tianbai Cui; Xu Yang; Chirag Vaswani; Jigang Wang; Rafael M. Fernandes; Peter P. Orth

doi:10.1103/PhysRevB.100.054504

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Impact of damping on the superconducting gap dynamics induced by intense terahertz pulses

Tianbai Cui, Xu Yang, Chirag Vaswani, Jigang Wang, Rafael M. Fernandes, Peter P. Orth

DOI 10.1103/PhysRevB.100.054504 · Physical Review B

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Abstract

We investigate the interplay between coherent gap dynamics and damping in superconductors taken out of equilibrium by strong optical pulses with subgap terahertz frequencies. A semiphenomenological formalism is developed to include the damping within the electronic subsystem that arises from effects beyond Bardeen-Cooper-Schrieffer mean-field theory, such as interactions between Bogoliubov quasiparticles and decay of the Higgs mode. These processes, conveniently expressed as longitudinal T1 and transverse T2 relaxation times in the standard pseudospin language for superconductors, cause the gap amplitude to be suppressed after the pulse is turned off, but before the timescale where thermalization occurs due to coupling to the lattice. We show that our model quantitatively captures the experimental gap dynamics reported here of NbN and Nb3Sn through the picosecond timescale.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	onset
Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16	Pressure not reported	onset