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TT: Fachverband Tiefe Temperaturen

TT 68: Superconductivity: Properties and Electronic Structure

TT 68.4: Vortrag

Donnerstag, 21. März 2024, 10:15–10:30, H 3010

Tracing the dynamics of superconducting order via transient terahertz third harmonic generation — •Min-Jae Kim1,2,3, Sergey Kovalev4, Mattia Udina5, Gideok Kim2, Matteo Puviani2, Thales de Olivera4, Jan-Christoph Deinert4, Dirk Manske2, Lara Benfatto5, and Stefan Kaiser1,2,31Institute of Solid State and Materials Physics, Technical University Dresden, Dresden, 01062, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, 70569, Germany — 34th Physics Institute and Research Center SCoPE, University of Stuttgart, Stuttgart, 70569, Germany — 4Helmholtz-Zentrum Dresden-Rossendorf, Dresden, 01328, Germany — 5Department of Physics and ISC-CNR, Sapienza University of Rome, Rome, 00185, Italy

Nonlinear THz third harmonic generation (THG) was shown to directly probe internal degrees of freedoms of the superconducting condensate and its exposure to external collective modes in the framework of driven Higgs modes. Here we extend this idea to light-driven nonequilibrium states in superconducting La2−xSrxCuO4 establishing a transient Higgs spectroscopy [1]. We perform an optical pump-THz-THG drive experiment and using 2D-spectroscopy we disentangle the driven TH response into the excited quasiparticles and condensates response. As such the light induced changes of the THG signals probe the ultrafast pair breaking dynamics and transient pairing amplitude of the condensate.

[1] Kim et. al., arXiv:2303.03288

Keywords: High-Tc Superconductor; Nonlinear Terahertz Spectroscopy; Pump-Probe Spectroscopy; Higgs mode; two-dimensional terahertz spectroscopy

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