Correlated Mott insulators in a strong electric field: The effects of phonon renormalization

Abstract

We characterize the response of a Mott insulating system to a static electric field in terms of its conducting and spectral properties. Dissipation is included by a coupling to fermionic baths and to either optical or acoustic phonons. This paper extends and completes the analysis made in a previous work by the authors [arXiv:2207.01921]. In the present work phonons are included diagrammatically within the Migdal approximation by also including self-consistency from the electronic feedback. The nonequilibrium steady-state is addressed by means of the dynamical mean-field theory based on the nonequilibrium Green's function approach, while the so-called auxiliary master equation approach is employed as impurity solver. With optical phonons the self-consistency suppresses the steady-state current at the onset of the metallic phase with respect to the nonself-consistent case. This is due to the interaction of phonons with the hot electrons of the lattice which increases their temperature, thus providing a less effective relaxation channel for the current-induced Joule heat. In addition, in the case of optical phonons the results are essentially independent of the temperature of the fermionic baths, as the latter is sensibly smaller than their characteristic frequency. On the other hand, with acoustic phonons the steady-state current is slightly suppressed by the self-consistent treatment only at field strengths close to half of the gap, away from the metallic phase, and especially at very small phonon frequency. Also, in this case the results seem to slightly depend on the temperature of the fermionic baths.

Data can be found at https://repository.tugraz.at/records/hgnz5-x5816

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Cited by in corpus (5)

• Photo-induced nonequilibrium states in Mott insulators
• Impact of disorder and phonons on the Hubbard bands of Mott insulators in strong electric fields
• Mixed-configuration approximation for multiorbital systems out of equilibrium
• Photodriven Mott insulating heterostructures: A steady-state study of impact ionization processes
• Iterated Perturbation Theory for Mott Insulators in a Static Electric Field with Optical Phonons