Počet záznamů: 1

Nonequilibrium transport through molecular junctions in the quantum regime

  1. 1.
    0365033 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    Koch, T. - Loos, Jan - Alvermann, A. - Fehske, H.
    Nonequilibrium transport through molecular junctions in the quantum regime.
    Physical Review. B. Roč. 84, č. 12 (2011), 125131/1-125131/16 ISSN 1098-0121
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: theory of electronic transport * scattering mechanisms * polarons and electron-phonon interactions * quantum dots
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.691, rok: 2011

    We consider a quantum dot, affected by a local vibrational mode and contacted to macroscopic leads, in the nonequilibrium steady-state regime. We apply a variational Lang-Firsov transformation and solve the equations of motion of the Green functions in the Kadanoff-Baym formalism up to a second order in the interaction coefficients. The variational determination of the transformation parameter through minimization of the thermodynamic potential allows us to calculate the electron/polaron spectral function and conductance for adiabatic to antiadiabatic phonon frequencies and weak to strong electron-phonon couplings. We investigate the qualitative impact of the quasiparticle renormalization on the inelastic electron tunneling spectroscopy signatures and discuss the possibility of a polaron induced negative differential conductance. In the high-voltage regime,we find that the polaron level follows the lead chemical potential to enhance resonant transport.
    Trvalý link: http://hdl.handle.net/11104/0200373