Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Superconductivity: Poster Session
TT 19.25: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Superconductors in Non–Equilibrium: Higgs Oscillations and Induced Superconductivity — •Nikolaj Bittner1, Holger Krull1,2, Andreas Schnyder1, Takami Tohyama3, and Dirk Manske1 — 1Max–Planck–Institut für Festkörperforschung, D–70569 Stuttgart, Germany — 2Lehrstuhl für Theoretische Physik, Technische Universität Dortmund, D–44221 Dortmund, Germany — 3Department of Applied Physics, Tokyo University of Science, Tokyo 125–8585, Japan
Nonequilibrium pump–probe time–domain spectroscopy opens new perspectives in studying the dynamical properties of the strongly correlated electron systems. In particular, new effects, such as transient superconductivity [1] or Higgs oscillations of the superconducting condensate [2], can be obtained. Using various methods we present a theoretical study of the nonequilibrium dynamics in superconductors. Firstly, within the framework of the density matrix formalism we study Higgs oscillations in superconductors, which allow to detect the properties of the superconducting condensate as a function of time. For two–band superconductors the interplay between the phase (Leggett) and amplitude (Higgs) modes is analyzed in detail and new predictions are made. Secondly, employing the time–dependent Lanczos algorithm to the one–dimensional extended Hubbard model we observe appearance of a transient Meissner effect, which is a fingerprint of the induced superconductivity.
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