Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 39: Superconductivity: (General) Theory
TT 39.1: Vortrag
Mittwoch, 22. März 2017, 09:30–09:45, HSZ 103
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
Recent development of optical pulses at THz and mid-infrared frequencies has reported indications of photo-induced superconductivity at temperatures much higher than superconducting transition temperature (Tc) in cuprate superconductors [1] and K-dopes C60 [2]. These are now a hot topic in the field of superconductivity.
In this contribution we present a theoretical study of the nonequilibrium dynamics in the one-dimensional extended Hubbard model at half filling. Particular emphasizes is on the possibility to induce superconductivity in this system driven out of equilibrium. Within the framework of the time-dependent Lanczos algorithm the time evolution of the Hubbard model is investigated for two different nonequilibrium scenarios, which occur by (i) an interaction quench and by (ii) action of a light pulse. For both cases the time dependent optical conductivity and the superconducting correlation functions are calculated. In particular, it was observed from these 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.
[1] S. Kaiser et al. PRB, 89, 184516 (2014);
D. Fausti et al. Science 331, 189 (2011)
[2] M. Mitrano et al. Nature, 530, 461 (2016)