Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-11
Phys. Rev. B 85, 085408 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 12 figures, extended discussion, added references
Scientific paper
10.1103/PhysRevB.85.085408
Thermoelectric effects in a double quantum dot system coupled to external magnetic/nonmagnetic leads are investigated theoretically. The basic thermoelectric transport characteristics, like thermopower, electronic contribution to heat conductance, and the corresponding figure of merit, have been calculated in terms of the linear response theory and Green function formalism in the Hartree-Fock approximation for Coulomb interactions. An enhancement of the thermal efficiency (figure of merit ZT) due to Coulomb blockade has been found. The magnitude of ZT is further considerably enhanced by quantum interference effects. Both the Coulomb correlations and interference effects lead to strong violation of the Wiedemann-Franz law. The influence of spin-dependent transport and spin bias on the thermoelectric effects (especially on Seebeck and spin Seebeck effects) is also analyzed.
Barnas Jozef
Trocha Piotr
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