Ultrafast spectroscopy of quasiparticle dynamics in cuprate superconductors
Wei Li, Chunfeng Zhang, Xiaoyong Wang, Jak Chakhalian, and Min Xiao
TL;DR
This paper reviews ultrafast pump-probe spectroscopy studies on cuprate superconductors, highlighting quasiparticle dynamics, electronic structures, and challenges like pairing mechanisms and phase transitions, with new data on YBa2Cu3O7-δ thin films.
Contribution
It provides a comprehensive review of quasiparticle dynamics in cuprates and presents new experimental data on YBa2Cu3O7-δ thin films related to these phenomena.
Findings
Quasiparticle dynamics are sensitive to electronic structures near the Fermi level.
Challenges include understanding pairing mechanisms and phase separation.
New data on YBa2Cu3O7-δ thin films relate to phase transitions.
Abstract
Ultrafast pump-probe spectroscopy is a powerful tool to study the nonequilibrium dynamics in high-Tc cuprate superconductors. The photo-induced quasiparticle (QP) dynamics revealed by pump-probe spectroscopy are sensitive to the near-Fermi level electronic structures. Here we review several selected examples to illustrate the enduring challenges including pairing glue, phase separation, and phase transitions in cuprate superconductors. We also present the data obtained on thin films of YBa2Cu3O7-{\delta} in connection to these issues.
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