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Thermoelectric effects in molecular quantum dots with contacts

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    0432315 - FZÚ 2015 RIV US eng J - Journal Article
    Koch, T. - Loos, Jan - Fehske, H.
    Thermoelectric effects in molecular quantum dots with contacts.
    Physical Review. B. Roč. 89, č. 15 (2014), "155133-1"-"155133-11". ISSN 1098-0121
    Institutional support: RVO:68378271
    Keywords : theory of electronic transport * scattering mechanisms * polarons and electron-phonon interactions * quantum dots
    Subject RIV: BM - Solid Matter Physics ; Magnetism
    Impact factor: 3.736, year: 2014

    We consider the steady-state thermoelectric transport through a vibrating molecular quantum dot that is contacted to macroscopic leads. For moderate electron-phonon interaction strength and comparable electronic and phononic timescales, we investigate the impact of the formation of a local polaron on the thermoelectric properties of the junction. We apply a variational Lang-Firsov transformation and solve the equations of motion in the Kadanoff-Baym formalism up to second order in the dot-lead coupling parameter. We calculate the thermoelectric current and voltage for finite temperature differences in the resonant and inelastic tunneling regimes. For a near resonant dot level, the formation of a local polaron can boost the thermoelectric effect because of the Franck-Condon blockade. The line shape of the thermoelectric voltage signal becomes asymmetrical due to the varying polaronic character of the dot state and in the nonlinear transport regime, vibrational signatures arise.
    Permanent Link: http://hdl.handle.net/11104/0236723

     
     
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