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

Abstract

In this study, 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. Lastly, we show that our model quantitatively captures the experimental gap dynamics reported here of NbN and Nb3 Sn through the picosecond timescale.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [1];  [2]
+ Show Author Affiliations
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1557775
Alternate Identifier(s):
OSTI ID: 1547956
Report Number(s):
IS-J-10002
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358; SC0012336
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Cui, Tianbai, Yang, Xu, Vaswani, Chirag, Wang, Jigang, Fernandes, Rafael M., and Orth, Peter P. Impact of damping on the superconducting gap dynamics induced by intense terahertz pulses. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.054504.
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Cui, Tianbai, Yang, Xu, Vaswani, Chirag, Wang, Jigang, Fernandes, Rafael M., & Orth, Peter P. Impact of damping on the superconducting gap dynamics induced by intense terahertz pulses. United States. https://doi.org/10.1103/PhysRevB.100.054504
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Cui, Tianbai, Yang, Xu, Vaswani, Chirag, Wang, Jigang, Fernandes, Rafael M., and Orth, Peter P. Mon . "Impact of damping on the superconducting gap dynamics induced by intense terahertz pulses". United States. https://doi.org/10.1103/PhysRevB.100.054504. https://www.osti.gov/servlets/purl/1557775.
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@article{osti_1557775,
title = {Impact of damping on the superconducting gap dynamics induced by intense terahertz pulses},
author = {Cui, Tianbai and Yang, Xu and Vaswani, Chirag and Wang, Jigang and Fernandes, Rafael M. and Orth, Peter P.},
abstractNote = {In this study, 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. Lastly, we show that our model quantitatively captures the experimental gap dynamics reported here of NbN and Nb3 Sn through the picosecond timescale.},
doi = {10.1103/PhysRevB.100.054504},
journal = {Physical Review B},
number = 5,
volume = 100,
place = {United States},
year = {Mon Aug 05 00:00:00 EDT 2019},
month = {Mon Aug 05 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.100.054504
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Cited by: 8 works
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Figures / Tables:

FIG. 1 FIG. 1: THz pump-probe specroscopy of NbN. (A) and (B) depict the real and imaginary parts of the optical conductivity, respectively. Gray curves show equilibrium results at T = 4 K (below Tc) and T = 15 K (above Tc), whereas the red curve is taken tpp = 10 psmore » after the THz pump. (C) Relative pump-induced change of the transmitted probe field strength ∆E/E (blue curve). The value of tgate is chosen as to be sensitive to changes in the transmittance around 4 meV. The red curve shows the pump profile. (D) Theoretical results for the gap evolution without (yellow line) and with (blue line) damping. The time scales T1 and T2 refer to the relaxation processes explained in the main text.« less
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