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
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  • 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.
Faculté des sciences et de médecine
Département de Physique
  • English
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