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Revealing Hund’s multiplets in Mott insulators under strong electric fields

  • Dasari, Nagamalleswararao Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
  • Li, Jiajun Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
  • Werner, Philipp Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
  • Eckstein, Martin Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
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    10.04.2020
Published in:
  • Physical Review B. - 2020, vol. 101, no. 16, p. 161107
English We investigate the strong-field dynamics of a paramagnetic two-band Mott insulator using real-time dynamical mean-field theory. We demonstrate that strong electric fields can lead to a transient localization of electrons. This nonequilibrium quantum effect allows us to reveal specific signatures of local correlations in the time-resolved photoemission spectrum. In particular, we demonstrate that the localization can be strong enough to produce atomiclike spin multiplets determined by the Hund's coupling J, and thus provide a way of measuring J inside the solid. Our simulation also fully incorporates nonlinear field-induced tunneling processes, which would lead to a dielectric breakdown in the steady state limit. A careful analysis of these processes, however, shows that they remain weak enough and do not prevent the measurement of the transiently localized spectra.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308647
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