- Autor
- Soratin, Max
- Von Der Linden, Wolfgang
- Lucrezi, Roman
- Arrigoni, Enrico
- TitelNonequilibrium Green's functions and their relation to the negative differential conductance in the interacting resonant level model
- Datei
- DOI10.1103/PhysRevB.99.075139
- Persistent Identifier
- Erschienen inPhysical review B
- Band99
- Erscheinungsjahr2019
- Heft7
- LicenceCC BY 4.0
- ISSN2469-9969
- Download Statistik1009
- Peer ReviewJa
- AbstractWe 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.
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