Hauptmenü
  • 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
  • ZugriffsrechteCC-BY
  • Download Statistik214
  • 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.