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Thermoelectric effects in molecular quantum dots with contacts
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SYSNO ASEP 0432315 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thermoelectric effects in molecular quantum dots with contacts Author(s) Koch, T. (DE)
Loos, Jan (FZU-D) RID
Fehske, H. (DE)Source Title Physical Review. B - ISSN 1098-0121
Roč. 89, č. 15 (2014), "155133-1"-"155133-11"Number of pages 11 s. Language eng - English Country US - United States Keywords theory of electronic transport ; scattering mechanisms ; polarons and electron-phonon interactions ; quantum dots Subject RIV BM - Solid Matter Physics ; Magnetism Institutional support FZU-D - RVO:68378271 UT WOS 000335499000003 EID SCOPUS 84899753523 DOI 10.1103/PhysRevB.89.155133 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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