Comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems

Sayyad, Sharareh; Žitko, Rok; Strand, Hugo U. R.; Werner, Philipp; Golež, Denis

doi:10.1103/PhysRevB.99.045118

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Journal article

Comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems

Sayyad, Sharareh Institute for Solid State Physics, University of Tokyo, Chiba, Japan
Žitko, Rok Faculty of Mathematics and Physics, University of Ljubljana, Slovenia - Jozef Stefan Institute, Ljubljana, Slovenia
Strand, Hugo U. R. Center for Computational Quantum Physics, Flatiron Institute, New York, USA
Werner, Philipp Department of Physics, University of Fribourg, Switzerland
Golež, Denis Department of Physics, University of Fribourg, Switzerland

09.01.2019

Published in:

Physical Review B. - 2019, vol. 99, no. 4, p. 045118

English We study equilibrium and nonequilibrium properties of electron-phonon systems described by the Hubbard-Holstein model using dynamical mean-field theory. In equilibrium, we benchmark the results for impurity solvers based on the one-crossing approximation and slave-rotor approximation against non-perturbative numerical renormalization group reference data. We also examine how well the low-energy properties of the electron-boson coupled systems can be reproduced by an effective static electron-electron interaction. The one-crossing and slave-rotor approximations are then used to simulate insulator-to-metal transitions induced by a sudden switch-on of the electron-phonon interaction. The slave-rotor results suggest the existence of a critical electron-phonon coupling above which the system is transiently trapped in a nonthermal metallic state with coherent quasiparticles. The same quench protocol in the one-crossing approximation results in a bad metallic state.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language