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

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

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 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.

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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.  https://www.osti.gov/servlets/purl/1492059.

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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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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

Electrodynamics of electron-doped iron pnictide superconductors: Normal-state properties journal, August 2010

Measurement of Recombination Lifetimes in Superconductors journal, July 1967

Critical speeding up of nonequilibrium electronic relaxation near nematic phase transition in unstrained Ba( Fe 1 − x Co x ) 2 As 2 journal, April 2017

Energy-Gap Dynamics of Superconducting NbN Thin Films Studied by Time-Resolved Terahertz Spectroscopy journal, October 2011

Ultrafast terahertz snapshots of excitonic Rydberg states and electronic coherence in an organometal halide perovskite journal, June 2017

Excitons and Plasmons in Superconductors journal, February 1961

Theory of nonequilibrium dynamics of multiband superconductors journal, January 2013

Light-Induced Superconductivity in a Stripe-Ordered Cuprate journal, January 2011

Ultrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides journal, February 2014

Superconductivity and spin-density waves in multiband metals journal, May 2010

Bose condensation in an attractive fermion gas: From weak to strong coupling superconductivity journal, May 1985

Reversible modulation and ultrafast dynamics of terahertz resonances in strongly photoexcited metamaterials journal, September 2012

Correlating quasiparticle excitations with quantum femtosecond magnetism in photoexcited nonequilibrium states of insulating antiferromagnetic manganites journal, June 2017

Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K journal, March 2008

Pair-Breaking and Superconducting State Recovery Dynamics in M g B 2 journal, December 2003

Pair-excitation energetics of highly correlated many-body states journal, September 2013

Terahertz-light quantum tuning of a metastable emergent phase hidden by superconductivity journal, June 2018

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe 2 As 2 journal, August 2010

Theory of the Anomalous Skin Effect in Normal and Superconducting Metals journal, July 1958

Femtosecond switching of magnetism via strongly correlated spin–charge quantum excitations journal, April 2013

Ultrafast softening in InMnAs journal, January 2004

Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach journal, March 2016

Dynamics of exciton formation for near band-gap excitations journal, December 2001

Spin excitations in the excitonic spin-density-wave state of the iron pnictides journal, November 2009

Coherent dynamics and pump-probe spectra of BCS superconductors journal, December 2007

Competing order and nature of the pairing state in the iron pnictides journal, July 2010

Quantum mechanical kinetic equations journal, September 1963

Kinetics of a Superconductor Excited with a Femtosecond Optical Pulse journal, September 2005

Ultrafast Terahertz Probes of Interacting Dark Excitons in Chirality-Specific Semiconducting Single-Walled Carbon Nanotubes journal, March 2015

Broadband terahertz generation from metamaterials journal, January 2014

Non-thermal separation of electronic and structural orders in a persisting charge density wave journal, July 2014

Ultrafast transient generation of spin-density-wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations journal, April 2012

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

Electrodynamics of electron-doped iron pnictide superconductors: Normal-state properties
journal, August 2010

Measurement of Recombination Lifetimes in Superconductors
journal, July 1967

Critical speeding up of nonequilibrium electronic relaxation near nematic phase transition in unstrained Ba( ${Fe}_{1 - x} {Co}_{x}$ ) $_{2} {As}_{2}$
journal, April 2017

Energy-Gap Dynamics of Superconducting NbN Thin Films Studied by Time-Resolved Terahertz Spectroscopy
journal, October 2011

Ultrafast terahertz snapshots of excitonic Rydberg states and electronic coherence in an organometal halide perovskite
journal, June 2017

Excitons and Plasmons in Superconductors
journal, February 1961

Theory of nonequilibrium dynamics of multiband superconductors
journal, January 2013

Light-Induced Superconductivity in a Stripe-Ordered Cuprate
journal, January 2011

Ultrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides
journal, February 2014

Superconductivity and spin-density waves in multiband metals
journal, May 2010

Bose condensation in an attractive fermion gas: From weak to strong coupling superconductivity
journal, May 1985

Reversible modulation and ultrafast dynamics of terahertz resonances in strongly photoexcited metamaterials
journal, September 2012

Correlating quasiparticle excitations with quantum femtosecond magnetism in photoexcited nonequilibrium states of insulating antiferromagnetic manganites
journal, June 2017

Iron-Based Layered Superconductor La[O _1- _x F _x ]FeAs ( x = 0.05−0.12) with T _c = 26 K
journal, March 2008

Pair-Breaking and Superconducting State Recovery Dynamics in ${M g B}_{2}$
journal, December 2003

Pair-excitation energetics of highly correlated many-body states
journal, September 2013

Terahertz-light quantum tuning of a metastable emergent phase hidden by superconductivity
journal, June 2018

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe ₂ As ₂
journal, August 2010

Theory of the Anomalous Skin Effect in Normal and Superconducting Metals
journal, July 1958

Femtosecond switching of magnetism via strongly correlated spin–charge quantum excitations
journal, April 2013

Ultrafast softening in InMnAs
journal, January 2004

Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
journal, March 2016

Dynamics of exciton formation for near band-gap excitations
journal, December 2001

Spin excitations in the excitonic spin-density-wave state of the iron pnictides
journal, November 2009

Coherent dynamics and pump-probe spectra of BCS superconductors
journal, December 2007

Competing order and nature of the pairing state in the iron pnictides
journal, July 2010

Quantum mechanical kinetic equations
journal, September 1963

Kinetics of a Superconductor Excited with a Femtosecond Optical Pulse
journal, September 2005

Ultrafast Terahertz Probes of Interacting Dark Excitons in Chirality-Specific Semiconducting Single-Walled Carbon Nanotubes
journal, March 2015

Broadband terahertz generation from metamaterials
journal, January 2014

Non-thermal separation of electronic and structural orders in a persisting charge density wave
journal, July 2014

Ultrafast transient generation of spin-density-wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations
journal, April 2012