Light-induced new collective modes in La${}_{1.905}$Ba${}_{0.095}$CuO${}_4$ superconductor

Abstract

We report near and mid-infrared pump c-axis terahertz probe measurement on a superconducting single crystal La${}_{1.905}$Ba${}_{0.095}$CuO${}_4$ with T${}_c$=32 K. The measurement reveals that the pump-induced change occurs predominantly at the Josephson plasma edge position below T${}_c$. Upon excited by the strong near-infrared pulses, the superconducting state is severely disturbed and incoherent quasiparticle excitations develop in frequency regime above the static plasma edge. However, within very short time delay ($\sim$1.5 ps) we observe the reappearance of a very sharp Josephson plasma edge at frequency lower than the static Josephson plasma edge and the emergence of a new light-induced Josephson mode at higher energy. The results imply that the light can induce new Josephson couplings with different coupling strengths. Similar but weaker effect is observed for the mid-infrared pump. No pump induced effect is detected above T${}_c$.

arXiv comment5 pages + supplementary

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Cited by in corpus (19)

• Photo-enhanced metastable c-axis electrodynamics in stripe ordered cuprate La${}_{1.885}$Ba${}_{0.115}$CuO${}_4$
• Pump frequency resonances for light-induced incipient superconductivity in YBa${}_2$Cu${}_3$O${}_{6.5}$
• Transient trapping into metastable states in systems with competing orders
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• Non-equilibrium phenomena in superconductors probed by femtosecond time-domain spectroscopy
• Photo-induced Superconducting State with Long-lived Disproportionate Band Filling in FeSe
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• Photo-induced nonequilibrium response in underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$ probed by time-resolved terahertz spectroscopy
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• Fate of transient order parameter domain walls in ultrafast experiments