Impact ionization processes in a photodriven Mott insulator: influence of phononic dissipation
arXiv:2208.14752 · doi:10.1103/PhysRevB.106.195140
Abstract
We study a model for photovoltaic energy collection consisting of a Mott insulating layer in presence of acoustic phonons, coupled to two wide-band fermion leads at different chemical potentials and driven into a nonequilibrium steady state by a periodic electric field. We treat electron correlations with nonequilibrium dynamical mean-field theory (DMFT) using the so-called auxiliary master equation approach as impurity solver and include dissipation by acoustic phonons via the Migdal approximation. For a small hybridization to the leads, we obtain a peak in the photocurrent as a function of the driving frequency which can be associated with impact ionization processes. For larger hybridizations the shallow peak suggests a suppression of impact ionization with respect to direct photovoltaic excitations. Acoustic phonons slightly enhance the photocurrent for small driving frequencies and suppress it at frequencies around the main peak at all considered hybridization strengths.
arXiv comment9 pages, 8 figures, data available at https://repository.tugraz.at/records/3jj3h-89r65
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Cited by in corpus (8)
- Photo-induced nonequilibrium states in Mott insulators
- Correlated Mott insulators in a strong electric field: The effects of phonon renormalization
- Site-selective doublon-holon dynamics in a pumped one-dimensional Hubbard superlattice with staggered Coulomb interactions
- Impact of disorder and phonons on the Hubbard bands of Mott insulators in strong electric fields
- A new pathway to impact ionization in a photo-excited one-dimensional ionic Hubbard model
- 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