Photodriven Mott insulating heterostructures: A steady-state study of impact ionization processes

Paolo Gazzaneo*, Daniel Werner, Tommaso Maria Mazzocchi, Enrico Arrigoni*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

We investigate the photocurrent and spectral features in a simplified model of a Mott photovoltaic system consisting of a multilayered insulating heterostructure. The central correlated region is coupled to two metallic leads kept at different chemical potentials. A periodic drive applied to the correlated region produces excited doublons and holons across the Mott gap, which are then separated by a potential gradient, which mimics the polarization-induced electric field present in oxide heterostructures. The nonequilibrium Floquet steady-state is addressed by means of dynamical mean-field theory and its Floquet extension, while the so-called auxiliary master equation approach is employed as impurity solver. We find that impact ionization, identified by a kink in the photocurrent as function of the driving frequency, becomes significant and is generally favored by weak, narrowband hybridizations to the leads beyond a certain strength of the driving field. On the other hand, in the case of a direct coupling to metallic leads with a flat band, we observe a drastic reduction of impact ionization and of the photocurrent itself.

Originalspracheenglisch
Aufsatznummer235134
FachzeitschriftPhysical Review B
Jahrgang109
Ausgabenummer23
DOIs
PublikationsstatusVeröffentlicht - 15 Juni 2024

ASJC Scopus subject areas

  • Elektronische, optische und magnetische Materialien
  • Physik der kondensierten Materie

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