Abstract
We evaluate the nonequilibrium single-particle Green's functions in the steady state of the interacting resonant level model (IRLM) under the effect of an applied bias voltage. Employing the so-called auxiliary master equation approach, we present accurate nonperturbative results for the nonequilibrium spectral and effective distribution functions, as well as for the current-voltage characteristics. We find a drastic change of these spectral properties between the regimes of low- and high-bias voltages and discuss the relation of these changes to the negative differential conductance (NDC), a prominent feature in the nonequilibrium IRLM. The anomalous evolution of the effective distribution function next to the impurity shown by our calculations suggests a mechanism whereby the impurity gets effectively decoupled from the leads at voltages where the NDC sets in, in agreement with previous renormalization group approaches. This scenario is qualitatively confirmed by a Hartree-Fock treatment of the model.
Originalsprache | englisch |
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Aufsatznummer | 075139 |
Fachzeitschrift | Physical Review B |
Jahrgang | 99 |
Ausgabenummer | 7 |
DOIs | |
Publikationsstatus | Veröffentlicht - 20 Feb. 2019 |
ASJC Scopus subject areas
- Elektronische, optische und magnetische Materialien
- Physik der kondensierten Materie