Nonequilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State

Yang, X.; Luo, L.; Mootz, M.; Patz, A.; Bud’ko, S. L.; Canfield, P. C.; Perakis, I. E.; Wang, J.

doi:10.1103/PhysRevLett.121.267001

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

Journal Article · 25 December 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.121.267001 · OSTI ID:1492059

Yang, X. ^[1]; Luo, L. ^[1]; Mootz, M. ^[2]; Patz, A. ^[1]; Bud’ko, S. L. ^[1]; Canfield, P. C. ^[1]; Perakis, I. E. ^[2]; Wang, J. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics

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.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Univ. of Alabama, Birmingham, AL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358; SC0019137

OSTI ID:: 1492059

Report Number(s):: IS-J--9790

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 121; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Light control of surface–bulk coupling by terahertz vibrational coherence in a topological insulator Yang, Xu; Luo, Liang; Vaswani, Chirag npj Quantum Materials, Vol. 5, Issue 1 https://doi.org/10.1038/s41535-020-0215-7	journal	February 2020
Terahertz-light quantum tuning of a metastable emergent phase hidden by superconductivity Yang, X.; Vaswani, C.; Sundahl, C. Nature Materials, Vol. 17, Issue 7 https://doi.org/10.1038/s41563-018-0096-3	journal	June 2018
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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