Thermopower of a Kondo-correlated quantum dot
R. Scheibner (1), H. Buhmann (1), D. Reuter (2), M.N. Kiselev (3) and, L.W. Molenkamp (1) ((1)Physikalisches Institut (EP3) Universit\"at, W\"urzburg, (2)Institut f\"ur Theoretische Physik Universit\"at, W\"urzburg,(3)Lehrstuhl f\"ur Festk\"orperphysik Ruhr-Universit\"at Bochum)
TL;DR
This study investigates the thermopower in a Kondo-correlated quantum dot, revealing deviations from classical relations due to spin correlations and spectral asymmetry, explained by an Anderson-impurity model.
Contribution
It provides experimental evidence of thermopower behavior in Kondo quantum dots and links it to spectral asymmetry using an Anderson-impurity framework.
Findings
Thermopower deviates from Mott relation in Kondo regime
Significant asymmetry in Kondo resonance spectral density
Behavior explained by Anderson-impurity model
Abstract
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
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