Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1803094 | Journal of Magnetism and Magnetic Materials | 2008 | 4 Pages |
Abstract
We study the thermopower and thermal conductivity of a gate-defined quantum dot, with a very strong Coulomb repulsion inside the dot, employing the X-boson approach for the impurity Anderson model. Our results show a change in the sign of the thermopower as function of the energy level of the quantum dot (gate voltage), which is associated with an oscillatory behavior and a suppression of the thermopower magnitude at low temperatures. We identify two relevant energy scales: a low temperature scale dominated by the Kondo effect and a Tâ¼Î temperature scale characterized by charge fluctuations. We also discuss the Wiedemann-Franz relation and the thermoelectric figure of merit. Our results are in qualitative agreement with recent experimental reports and other theoretical treatments.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
R. Franco, J. Silva-Valencia, M.S. Figueira,