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Title: Ultrafast Gap Dynamics and Electronic Interactions in a Photoexcited Cuprate Superconductor

Abstract

We perform time- and angle-resolved photoemission spectroscopy (trARPES) on optimally doped Bi 2Sr 2CaCu 2O 8+δ (BSCCO-2212) using sufficient energy resolution (9 meV) to resolve the k-dependent near-nodal gap structure on time scales where the concept of an electronic pseudotemperature is a useful quantity, i.e., after electronic thermalization has occurred. We study the ultrafast evolution of this gap structure, uncovering a very rich landscape of decay rates as a function of angle, temperature, and energy. We explicitly focus on the quasiparticle states at the gap edge as well as on the spectral weight inside the gap that “fills” the gap—understood as an interaction, or self-energy effect—and we also make high resolution measurements of the nodal states, enabling a direct and accurate measurement of the electronic temperature (or pseudotemperature) of the electrons in the system. Rather than the standard method of interpreting these results using individual quasiparticle scattering rates that vary significantly as a function of angle, temperature, and energy, we show that the entire landscape of relaxations can be understood by modeling the system as following a nonequilibrium, electronic pseudotemperature that controls all electrons in the zone. Furthermore, this model has zero free parameters, as we obtain the crucial informationmore » of the SC gap Δ and the gap-filling strength Γ TDoS by connecting to static ARPES measurements. The quantitative and qualitative agreement between data and model suggests that the critical parameters and interactions of the system, including the pairing interactions, follow parametrically from the electronic pseudotemperature. In conclusion, we expect that this concept will be relevant for understanding the ultrafast response of a great variety of electronic materials, even though the electronic pseudotemperature may not be directly measurable.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1400429
Alternate Identifier(s):
OSTI ID: 1412782
Report Number(s):
BNL-114804-2017-JA
Journal ID: ISSN 2160-3308; PRXHAE; 041013
Grant/Contract Number:  
SC0112704; SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review X
Additional Journal Information:
Journal Name: Physical Review X Journal Volume: 7 Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Parham, S., Li, H., Nummy, T. J., Waugh, J. A., Zhou, X. Q., Griffith, J., Schneeloch, J., Zhong, R. D., Gu, G. D., and Dessau, D. S. Ultrafast Gap Dynamics and Electronic Interactions in a Photoexcited Cuprate Superconductor. United States: N. p., 2017. Web. doi:10.1103/PhysRevX.7.041013.
Parham, S., Li, H., Nummy, T. J., Waugh, J. A., Zhou, X. Q., Griffith, J., Schneeloch, J., Zhong, R. D., Gu, G. D., & Dessau, D. S. Ultrafast Gap Dynamics and Electronic Interactions in a Photoexcited Cuprate Superconductor. United States. doi:10.1103/PhysRevX.7.041013.
Parham, S., Li, H., Nummy, T. J., Waugh, J. A., Zhou, X. Q., Griffith, J., Schneeloch, J., Zhong, R. D., Gu, G. D., and Dessau, D. S. Fri . "Ultrafast Gap Dynamics and Electronic Interactions in a Photoexcited Cuprate Superconductor". United States. doi:10.1103/PhysRevX.7.041013.
@article{osti_1400429,
title = {Ultrafast Gap Dynamics and Electronic Interactions in a Photoexcited Cuprate Superconductor},
author = {Parham, S. and Li, H. and Nummy, T. J. and Waugh, J. A. and Zhou, X. Q. and Griffith, J. and Schneeloch, J. and Zhong, R. D. and Gu, G. D. and Dessau, D. S.},
abstractNote = {We perform time- and angle-resolved photoemission spectroscopy (trARPES) on optimally doped Bi2Sr2CaCu2O8+δ (BSCCO-2212) using sufficient energy resolution (9 meV) to resolve the k-dependent near-nodal gap structure on time scales where the concept of an electronic pseudotemperature is a useful quantity, i.e., after electronic thermalization has occurred. We study the ultrafast evolution of this gap structure, uncovering a very rich landscape of decay rates as a function of angle, temperature, and energy. We explicitly focus on the quasiparticle states at the gap edge as well as on the spectral weight inside the gap that “fills” the gap—understood as an interaction, or self-energy effect—and we also make high resolution measurements of the nodal states, enabling a direct and accurate measurement of the electronic temperature (or pseudotemperature) of the electrons in the system. Rather than the standard method of interpreting these results using individual quasiparticle scattering rates that vary significantly as a function of angle, temperature, and energy, we show that the entire landscape of relaxations can be understood by modeling the system as following a nonequilibrium, electronic pseudotemperature that controls all electrons in the zone. Furthermore, this model has zero free parameters, as we obtain the crucial information of the SC gap Δ and the gap-filling strength ΓTDoS by connecting to static ARPES measurements. The quantitative and qualitative agreement between data and model suggests that the critical parameters and interactions of the system, including the pairing interactions, follow parametrically from the electronic pseudotemperature. In conclusion, we expect that this concept will be relevant for understanding the ultrafast response of a great variety of electronic materials, even though the electronic pseudotemperature may not be directly measurable.},
doi = {10.1103/PhysRevX.7.041013},
journal = {Physical Review X},
number = 4,
volume = 7,
place = {United States},
year = {2017},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevX.7.041013

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Cited by: 3 works
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