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Title: Nonequilibrium Pair Breaking in Ba ( Fe 1 - x Co x ) 2 As 2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State

Abstract

Ultrafast terahertz (THz) pump-probe spectroscopy reveals an unusual out-of-equilibrium Cooper pair nonlinear dynamics and a nonequilibrium state driven by femtosecond (fs) photoexcitation of superconductivity (SC) in iron pnictides. Following fast SC quench via hot-phonon scattering, a second, abnormally slow (many hundreds of picoseconds), SC quench regime is observed prior to any recovery. Importantly, a nonlinear pump fluence dependence is identified for this remarkably long prebottleneck dynamics that are sensitive to both doping and temperature. Here, using quantum kinetic modeling we argue that the buildup of excitonic interpocket correlation between electron-hole (e - h) quasiparticles (QP) quenches SC after fs photoexcitation leading to a long-lived, many-QP excitonic state.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [2];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1492059
Alternate Identifier(s):
OSTI ID: 1488904
Report Number(s):
IS-J-9790
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
W911NF-15-1-0135; SC0019137; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 26; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yang, X., Luo, L., Mootz, M., Patz, A., Bud’ko, S. L., Canfield, P. C., Perakis, I. E., and Wang, J. Nonequilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.267001.
Yang, X., Luo, L., Mootz, M., Patz, A., Bud’ko, S. L., Canfield, P. C., Perakis, I. E., & Wang, J. Nonequilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State. United States. doi:10.1103/PhysRevLett.121.267001.
Yang, X., Luo, L., Mootz, M., Patz, A., Bud’ko, S. L., Canfield, P. C., Perakis, I. E., and Wang, J. Wed . "Nonequilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State". United States. doi:10.1103/PhysRevLett.121.267001. https://www.osti.gov/servlets/purl/1492059.
@article{osti_1492059,
title = {Nonequilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State},
author = {Yang, X. and Luo, L. and Mootz, M. and Patz, A. and Bud’ko, S. L. and Canfield, P. C. and Perakis, I. E. and Wang, J.},
abstractNote = {Ultrafast terahertz (THz) pump-probe spectroscopy reveals an unusual out-of-equilibrium Cooper pair nonlinear dynamics and a nonequilibrium state driven by femtosecond (fs) photoexcitation of superconductivity (SC) in iron pnictides. Following fast SC quench via hot-phonon scattering, a second, abnormally slow (many hundreds of picoseconds), SC quench regime is observed prior to any recovery. Importantly, a nonlinear pump fluence dependence is identified for this remarkably long prebottleneck dynamics that are sensitive to both doping and temperature. Here, using quantum kinetic modeling we argue that the buildup of excitonic interpocket correlation between electron-hole (e - h) quasiparticles (QP) quenches SC after fs photoexcitation leading to a long-lived, many-QP excitonic state.},
doi = {10.1103/PhysRevLett.121.267001},
journal = {Physical Review Letters},
number = 26,
volume = 121,
place = {United States},
year = {2018},
month = {12}
}

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Cited by: 12 works
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