Naslov
Thermoelectric effects in correlated quantum dots and molecules

Autori
Schoeps, V. ; Zlatić, Veljko ; Costi, Theo

Izvornik
Journal of physics. Conference series (1742-6588) 273 (2011); 012155-012158

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
thermoelectric effects; correlated quantum dots and molecules
(thermoelectric effects in correlated quantum dots and molecules)

Sažetak
We investigate thermoelectric properties of correlated quantum dots and molecules, described by a single level Anderson model coupled to conduction electron leads, by using Wilson's numerical renormalization group method. In the Kondo regime, the thermopower, $S(T)$, exhibits two sign changes, at temperatures $T=T_{; ; ; ; ; 1}; ; ; ; ; $ and $T=T_{; ; ; ; ; 2}; ; ; ; ; >T_{; ; ; ; ; 1}; ; ; ; ; $. We find that $T_{; ; ; ; ; 2}; ; ; ; ; $ is of order the level width $\Gamma$ and $T_{; ; ; ; ; 1}; ; ; ; ; > T_{; ; ; ; ; p}; ; ; ; ; \approx T_{; ; ; ; ; K}; ; ; ; ; $, where $T_{; ; ; ; ; p}; ; ; ; ; $ is the position of the Kondo induced peak in the thermopower and $T_{; ; ; ; ; K}; ; ; ; ; $ is the Kondo scale. No sign change is found outside the Kondo regime, or, for weak correlations, making a sign change in $S(T)$ a particularly sensitive signature of strong correlations and Kondo physics. For molecules, we investigate the effect of screening by conduction electrons on the thermoelectric transport. We find that a large screening interaction enhances the figure of merit in the Kondo and mixed valence regimes.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je prezentirasn na skupu International Conference on Strongly Correlated Electron Systems (SCES 2010), održanom od 27.06–02.07.2010.g., Santa Fe, New Mexico, SAD.

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