### Abstract

correlated layer connected to two metallic leads held at different chemical potentials. We address, in particular,

the issue of impact ionization, whereby a particle photoexcited to the high-energy part of the upper Hubbard band

uses its extra energy to produce a second particle-hole excitation. We find a drastic increase of the photocurrent

upon entering the frequency regime where impact ionization is possible. At large values of the Mott gap, where

impact ionization is energetically not allowed, we observe a suppression of the current and a piling up of charge

in the high-energy part of the upper Hubbard band. Our study is based on a Floquet dynamical mean-field theory

treatment of the steady state with the so-called auxiliary master equation approach as impurity solver. We verify

that an additional approximation, taking the self-energy diagonal in the Floquet indices, is appropriate for the

parameter range we are considering.

Originalsprache | englisch |
---|---|

Aufsatznummer | 115113 |

Seitenumfang | 10 |

Fachzeitschrift | Physical Review / B |

Jahrgang | 97 |

Ausgabenummer | 11 |

DOIs | |

Publikationsstatus | Veröffentlicht - 8 Mär 2018 |

### Fingerprint

### Fields of Expertise

- Advanced Materials Science

### Treatment code (Nähere Zuordnung)

- Theoretical

### Dies zitieren

*Physical Review / B*,

*97*(11), [115113]. https://doi.org/10.1103/PhysRevB.97.115113

**Impact ionization processes in the steady state of a driven Mott insulating layer coupled to metallic leads.** / Sorantin, Max Erich; Arrigoni, Enrico; Dorda, Antonius; Held, Karsten.

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Forschung › Begutachtung

*Physical Review / B*, Jg. 97, Nr. 11, 115113. https://doi.org/10.1103/PhysRevB.97.115113

}

TY - JOUR

T1 - Impact ionization processes in the steady state of a driven Mott insulating layer coupled to metallic leads

AU - Sorantin, Max Erich

AU - Arrigoni, Enrico

AU - Dorda, Antonius

AU - Held, Karsten

PY - 2018/3/8

Y1 - 2018/3/8

N2 - We study a simple model of photovoltaic energy harvesting across a Mott-insulating gap consisting of acorrelated layer connected to two metallic leads held at different chemical potentials. We address, in particular,the issue of impact ionization, whereby a particle photoexcited to the high-energy part of the upper Hubbard banduses its extra energy to produce a second particle-hole excitation. We find a drastic increase of the photocurrentupon entering the frequency regime where impact ionization is possible. At large values of the Mott gap, whereimpact ionization is energetically not allowed, we observe a suppression of the current and a piling up of chargein the high-energy part of the upper Hubbard band. Our study is based on a Floquet dynamical mean-field theorytreatment of the steady state with the so-called auxiliary master equation approach as impurity solver. We verifythat an additional approximation, taking the self-energy diagonal in the Floquet indices, is appropriate for theparameter range we are considering.

AB - We study a simple model of photovoltaic energy harvesting across a Mott-insulating gap consisting of acorrelated layer connected to two metallic leads held at different chemical potentials. We address, in particular,the issue of impact ionization, whereby a particle photoexcited to the high-energy part of the upper Hubbard banduses its extra energy to produce a second particle-hole excitation. We find a drastic increase of the photocurrentupon entering the frequency regime where impact ionization is possible. At large values of the Mott gap, whereimpact ionization is energetically not allowed, we observe a suppression of the current and a piling up of chargein the high-energy part of the upper Hubbard band. Our study is based on a Floquet dynamical mean-field theorytreatment of the steady state with the so-called auxiliary master equation approach as impurity solver. We verifythat an additional approximation, taking the self-energy diagonal in the Floquet indices, is appropriate for theparameter range we are considering.

UR - https://arxiv.org/abs/1708.05011

U2 - 10.1103/PhysRevB.97.115113

DO - 10.1103/PhysRevB.97.115113

M3 - Article

VL - 97

JO - Physical Review / B

JF - Physical Review / B

SN - 1098-0121

IS - 11

M1 - 115113

ER -