Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: (General) Theory
TT 14.9: Vortrag
Montag, 7. März 2016, 17:30–17:45, H19
Induced Superconductivity in the Hubbard model — •Nikolaj Bittner1, Takami Tohyama2, and Dirk Manske1 — 1Max–Planck–Institut für Festkörperforschung, D–70569 Stuttgart, Germany — 2Department of Applied Physics, Tokyo University of Science, Tokyo 125–8585, Japan
New insights into the properties of the strongly correlated electron system can be gained by studying it in nonequilibrium. For instance, under the action of a strong laser pulse the system can undergo a phase transition and even the induced superconductivity may occur [1,2].
In this contribution we present a theoretical study of the nonequilibrium dynamics in the one-dimensional extended Hubbard model. Particular emphasis is on the possibility to induce superconductivity in this system driven out of equilibrium. Within the framework of the time-dependent Lanczos algorithm we investigate the time evolution of our model for two different nonequilibrium scenarios, which occur by (i) an interaction quench and by (ii) action of a light pulse. For both cases we calculate the time dependent optical conductivity and the superconducting correlation functions. In particular, we observe from our calculations appearance of a transient Meissner effect, which is a fingerprint of the induced superconductivity. This is in agreement with the obtained correlation functions and opens a new way to induce superconductivity in an experiment.
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D. Fausti et al., Science 331, 189 (2011)