Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 50: Superconductivity: Theory II
TT 50.2: Talk
Wednesday, March 20, 2024, 15:15–15:30, H 3005
Theory of Superconductors in non-equilibrium: response of the Higgs mode — •Sida Tian1, Rafael Haenel1,2, and Dirk Manske1 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 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. Here we present a response theory based on Keldysh formalism that allows one to capture the dynamics of a superconductor in the non-equilibrium regime. The method is based on a generalisation of the Kubo formula, and compute the response of a non-equilibrium state subject to a small external perturbation. Because of this, we can also isolate contributions from different channels to the electromagnetic response kernel. This theory allows one to capture phenomena in pump-probe experiment beyond Matsubara formalism, and gives insight into the dynamics of superconductors away from equilibrium.
Keywords: Keldysh Formalism; Non-Equilibrium Physics; Superconductivity; Pump Probe Physics