Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.14: Poster
Monday, March 17, 2025, 15:00–18:00, P4
Higgs collective mode in superconductors: in- and out-of equilibrium — •Sida Tian1, Rafael Haenel1,2, and Dirk Manske1 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart — 2Quantum Matter Institute, University of British Columbia, Vancouver V6T 1Z4, Canada
Collective modes in superconductors encode rich information about the superconducting state. Experimentally probing them requires THz lasers that push the system away from equilibrium. We present a theory of non-equilibrium response based on Keldysh formalism, and introduce a recent developed experimental technique of Non-equilibrium Antistokes Raman Scattering. We further comment on the influence of higher-order fluctuations to collective modes, which will change the collective mode mass. This implies that in circumstances where quantum corrections become relevant such as strong coupling, the Higgs mode will move inside the pair breaking gap.
Keywords: Higgs Mode; Hubbard-Stratonovich Transformation; Keldysh Formalism; Raman