Thermoelectric effects in correlated quantum dots and molecules (CROSBI ID 172200)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Schoeps, V. ; Zlatić, Veljko ; Costi, Theo
engleski
Thermoelectric effects in correlated quantum dots and molecules
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.
thermoelectric effects in correlated quantum dots and molecules
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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Podaci o izdanju
273
2011.
012155-012158
objavljeno
1742-6588
10.1088/1742-6596/273/1/012155