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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Properties and Electronic Structure

TT 14.8: Vortrag

Montag, 9. März 2026, 17:00–17:15, HSZ/0103

Probing Charge Density Wave in Superconductors via Phase-resolved Higgs Spectroscopy — •Liwen Feng¹, Igor Ilyakov², Jan-Christoph Deinert², Hao Chu³, and Stefan Kaiser¹ — ¹TUD Dresden University of Technology, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Germany — ³Shanghai Jiao Tong University, China

Superconductivity (SC) and charge density wave (CDW) orders often coexist in high-Tc superconductors, and their interplay is essential for understanding these correlated systems. Using high-field terahertz radiation, we coherently drive collective modes and investigate third-harmonic generation (THG) in superconductors exhibiting both CDW amplitude fluctuations and Higgs oscillations. In 2H-NbSe₂ and hole-doped La_2−xSr_xCuO₄, we identify a clear Fano interference between CDW fluctuations and Higgs oscillations [1, 2]. In contrast, electron-doped La_2−xCe_xCuO₄ shows distinct coupling behavior, revealing not only a weak Higgs-CDW interaction but also signatures of an intrinsic, field-depinned CDW [3]. These results establish THz phase-resolved Higgs spectroscopy as a powerful method for probing CDW dynamics and intertwined orders in superconductors.
[1] H. Chu et al., Nat Commun. 14 (2023) 1343
[2] L. Feng et al., Phys Rev B 108 (2023) L100504
[3] L. Feng et al., arXiv:2504.11947 (2025)

Keywords: Higgs Spectroscopy; Superconductivity; Charge density wave; Third harmonic generation