Počet záznamů: 1
Thermoelectric effects in molecular quantum dots with contacts
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SYSNO ASEP 0432315 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Thermoelectric effects in molecular quantum dots with contacts Tvůrce(i) Koch, T. (DE)
Loos, Jan (FZU-D) RID
Fehske, H. (DE)Zdroj.dok. Physical Review. B - ISSN 1098-0121
Roč. 89, č. 15 (2014), "155133-1"-"155133-11"Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova theory of electronic transport ; scattering mechanisms ; polarons and electron-phonon interactions ; quantum dots Vědní obor RIV BM - Fyzika pevných látek a magnetismus Institucionální podpora FZU-D - RVO:68378271 UT WOS 000335499000003 EID SCOPUS 84899753523 DOI 10.1103/PhysRevB.89.155133 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2015
Počet záznamů: 1