Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.7: Talk
Tuesday, March 18, 2025, 11:15–11:30, H32
Higgs spectroscopy on the interplay of superconductivity and charge density waves — •Liwen Feng1,2, Tim Priessnitz2, Thales De Oliveira3, Jan-Christoph Deinert3, Sergey Kovalev3, Hao Chu4, and Stefan Kaiser1 — 1TUD Dresden University of Technology, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3Helmholtz-Zentrum Dresden-Rossendorf, Germany — 4Shanghai Jiao Tong University, China
Superconductivity (SC) and charge density wave (CDW) often coexist. In the framework of Higgs Spectroscopy, we use high-field terahertz pulses to coherently drive the corresponding Higgs and CDW amplitude modes and investigate their interplay directly in the third harmonic generation (THG) signals. Our findings reveal that the interaction between CDW fluctuations and Higgs oscillations lead to a Fano resonance [1]. We will show that we can characterize the interplay by directly investigating the relative phase responses of these modes in the time-domain THG signal [1]. We will discuss competing interactions of SC with long-range CDW order in 2H-NbSe2 [1] and hole-doped cuprate La2−xSrxCuO4, interaction with short-range CDW order in the electron-doped cuprate La2−xCexCuO4, and a noninteracting scenario in the Bismuthate superconductor Ba1−xRbxBiO3.
[1] H. Chu et al., Nat Commun. 14 (2023) 1343.
Keywords: Higgs Spectroscopy; Superconductivity; Charge density wave; Third harmonic generation; Fano resonance