Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.10: Talk
Monday, September 5, 2022, 12:00–12:15, H23
Fano interference of the Higgs response and CDW fluctuations in cuprate high-Tc superconductors — •Liwen Feng1,2,3, Hao Chu1,2,4, Sergey Kovalev5, Lukas Schwarz1, Tao Dong6, Min-Jae Kim1,2,3, Gideok Kim1, Gennady Logvenov1, Bernhard Keimer1, Dirk Manske1, Nanlin Wang6, Jan-Christoph Deinert5, and Stefan Kaiser1,2,3 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 24th Physics Institute, University of Stuttgart, Stuttgart, Germany — 3Institute of Solid State and Materials Physics, Technical University Dresden, Dresden, Germany — 4Quantum Matter Institute, University of British Columbia, Vancouver, Canada — 5Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 6International Center for Quantum Materials, Peking University, Beijing, China
Cuprate high-Tc superconductors exhibit a rich phase diagram due to the presence of multiple orders. The interplay of these orders is difficult to access directly by experimental probes. Here, we introduce phase-resolved Higgs spectroscopy, i.e. THz driven amplitude oscillations of the superconducting order parameter. We find a Fano interference of the driven Higgs mode with charge density fluctuations in superconducting La2−xSrxCuO2 (0.05≤ x≤ 0.25). The interference manifests itself as a distinct jump in the phase of the driven Higgs oscillation, which we characterize in an extensive doping- and magnetic field-dependent study. As such, Higgs spectroscopy provides a novel and direct view on the intriguing interplay of charge density fluctuations and superconductivity in high-Tc cuprates.