Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-10-26
Phys. Rev. Lett. 95, 176602 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures, revised version, changed figures
Scientific paper
10.1103/PhysRevLett.95.176602
The thermopower of a Kondo-correlated gate-defined quantum dot is studied using a current heating technique. In the presence of spin correlations the thermopower shows a clear deviation from the semiclassical Mott relation between thermopower and conductivity. The strong thermopower signal indicates a significant asymmetry in the spectral density of states of the Kondo resonance with respect to the Fermi energies of the reservoirs. The observed behavior can be explained within the framework of an Anderson-impurity model. Keywords: Thermoelectric and thermomagnetic effects, Coulomb blockade, single electron tunneling, Kondo-effect PACS Numbers: 72.20.Pa, 73.23.Hk
Buhmann Hartmut
Kiselev Michael N.
Molenkamp Laurens W.
Reuter Dennis
Scheibner R.
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