SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.12: Poster
Montag, 27. September 2021, 13:30–16:00, P
Enhanced Higgs oscillations in unconventional superconductors — •Matteo Puviani1, Dirk Manske1, and Rudi Hackl2 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching, Germany
In superconductors the Anderson-Higgs mechanism allows for the existence of a collective amplitude (Higgs) mode which can couple to eV-light mainly in a non-linear Raman-like process. While the observed properties of the Higgs mode in clean, conventional, isotropic superconductors can be explained within a BCS picture, strong interaction effects with other modes in anisotropic d-wave superconductors are likely. In our work we have calculated the Raman contribution of the Higgs mode from a new perspective, including many-body Higgs oscillations effects and their consequences in steady-state Raman spectroscopy [1]. This solves the long-standing problem of the A1g symmetry Raman spectrum in d-wave superconductors [2]. In order to test our theory, we predicted the presence of measurable characteristic oscillations in THz quench-optical probe time-dependent reflectivity experiments[1,3].
[1] M. Puviani et al., arxiv: 2012.01922
[2] T.P. Devereaux et al., Phys. Rev. Lett. 72, 396 (1994)
[3] S. Nakamura et al., Phys. Rev. Lett. 122, 257001 (2019)