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

doi:10.1103/PhysRevLett.121.267001

This content will become publicly available on December 26, 2019

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:

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

Publication Date:: 2018-12-26

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

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.

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                    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.

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                    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.

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@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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DOI: 10.1103/PhysRevLett.121.267001

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Works referenced in this record:

Broadband terahertz generation from metamaterials
journal, January 2014

Luo, Liang; Chatzakis, Ioannis; Wang, Jigang
Nature Communications, Vol. 5, Article No. 3055
DOI: 10.1038/ncomms4055

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Similar Records

This content will become publicly available on December 26, 2019

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

Abstract

Citation Formats

Broadband terahertz generation from metamaterials journal, January 2014

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

Broadband terahertz generation from metamaterials
journal, January 2014