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Possible light-induced superconductivity in a strongly correlated electron system

  • Bittner, Nikolaj Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Department of Physics, University of Fribourg, Switzerland
  • Tohyama, Takami Department of Applied Physics, Tokyo University of Science, Katsushika, Tokyo, Japan
  • Kaiser, Stefan Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - 4th Physics Institute, University of Stuttgart, Germany
  • Manske, Dirk Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
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  • Journal of the Physical Society of Japan. - 2019, vol. 88, no. 4, p. 044704
English Using a nonequilibrium implementation of the Lanczos-based exact diagonalisation technique we study the possibility of the light-induced superconducting phase coherence in a solid state system after an ultrafast optical excitation. In particular, we investigate the buildup of superconducting correlations by calculating an exact time- dependent wave function reflecting the properties of the system in non-equilibrium and the corresponding transient response functions. Within our picture we identify a possible transient Meissner effect after dynamical quenching of the non- superconducting wavefunction and extract a characteristic superfluid density that we compare to experimental data. Finally, we find that the stability of the induced superconducting state depends crucially on the nature of the excitation quench: namely, a pure interaction quench induces a long-lived superconducting state, whereas a phase quench leads to a short-lived transient superconductor.
Faculté des sciences et de médecine
Département de Physique
  • English
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