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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.25: Poster

Montag, 26. März 2007, 15:00–17:30, Poster A

Quantum dot as a thermal rectifier — Ralf Scheibner¹, •Christian Praetorius¹, Ines Hense¹, Markus König¹, Dirk Reuter², Andreas Wieck², Hartmut Buhmann¹, and Laurens Molenkamp¹ — ¹Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany

A magnetic field parallel to the plane of a 2DEG is used to control the energy distribution of states in a gate defined quantum dot. In high magnetic fields, rearrangements in the spin system favor states with a high orbital quantum number and introduce an asymmetry in the coupling of the quantum dot to its leads. We investigate the electric, thermo-electric, and thermal transport properties in this case of an asymmetric quantum dot-lead coupling. Thermovoltage measurements agree well with numerical analysis on the basis of a resonant tunneling model for transport using measurements data from non-linear conductance measurements. Further theoretical model investigations reveal that the quantum dot intrinsically acts as a thermal rectifier.