Journal article

Field-induced polaron formation in the Holstein-Hubbard model

  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
  • Eckstein, Martin Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Germany
Published in:
  • EPL (Europhysics Letters). - 2015, vol. 109, no. 3, p. 37002
English We study the effect of strong DC and pulsed electric fields on a Mott insulating system with coupling to optical phonons. A DC field of the order of the gap induces a metallic state characterized by polaronic features in the gap region and a partially inverted population. In this quasi-steady state, the field-induced doublon-hole production is balanced by a phonon-enhanced doublon-hole recombination. The photo-excitation of carriers by a pulsed field leads to similar modifications of the electronic structure in the gap region, and an associated reduction of the doublon life-time. We demonstrate that the field-induced localization of electrons effectively enhances the phonon coupling, an effect which should be measureable with time-resolved photo-emission spectroscopy.
Faculté des sciences et de médecine
Département de Physique
  • English
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