Regensburg 2007 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 13: Poster 1
HL 13.25: Poster
Monday, March 26, 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.