Thermopower of a Kondo-correlated quantum dot

(2)Institut f\"ur Theoretische Physik Universit\"at W\"urzburg; (3)Lehrstuhl f\"ur Festk\"orperphysik Ruhr-Universit\"at Bochum); D. Reuter (2); H. Buhmann (1); L.W. Molenkamp (1) ((1)Physikalisches Institut (EP3) Universit\"at W\"urzburg; M.N. Kiselev (3); R. Scheibner (1)

arxiv: cond-mat/0410671 · v2 · submitted 2004-10-26 · ❄️ cond-mat.mes-hall · cond-mat.str-el

Thermopower of a Kondo-correlated quantum dot

R. Scheibner (1) , H. Buhmann (1) , D. Reuter (2) , M.N. Kiselev (3) , 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) This is my paper

classification ❄️ cond-mat.mes-hall cond-mat.str-el

keywords thermopowerkondo-correlatedquantumanderson-impurityasymmetrybehaviorblockadeclear

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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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Thermopower of a Kondo-correlated quantum dot

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