Light-induced nonequilibrium response of the superconducting cuprate La${}_{2-x}$Sr${}_x$CuO${}_4$

Abstract

We report the dynamics of the cuprate superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$ ($x=0.14$) after intense photoexcitation utilizing near-infrared (800 nm) optical pump-terahertz probe spectroscopy. In the superconducting state at 5 K, we observed a redshift of the Josephson plasma resonance that sustains for hundreds of picoseconds after the photoexcitation, indicating the destruction of the $c$-axis superconducting coherence. We show that the metastable spectral features can be described by the photoinduced surface heating of the sample. We also demonstrate that the conventional analysis used to extract the spectra of the photoexcited surface region can give rise to artifacts in the nonequilibrium response.

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Cited by in corpus (15)

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• Higgs-mediated optical amplification in a non-equilibrium superconductor
• Non-equilibrium phenomena in superconductors probed by femtosecond time-domain spectroscopy
• Cavity magnon-polaritons in cuprate parent compounds
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• Photo-induced nonequilibrium response in underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$ probed by time-resolved terahertz spectroscopy
• Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K${}_3$C${}_{60}$
• Coherent Emission from Surface Josephson Plasmons in Striped Cuprates
• Optical Enhancement of Superconductivity via Targeted Destruction of Charge Density Waves
• Squeezed Josephson plasmons in driven YBa${}_2$Cu${}_3$O${}_{6+x}$
• Pump induced motion of an interface between competing orders
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• Nonequilibrium hysteretic phase transitions in periodically light-driven superconductors