Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 25: Transport
HL 25.4: Talk
Monday, March 14, 2011, 16:30–16:45, POT 151
Tunable transverse rectification in density-modulated 2D-systems — •Andy Quindeau1, Arkadius Ganczarczyk1, Martin Geller1, Axel Lorke1, Dirk Reuter2, and Andreas D. Wieck2 — 1Experimental Physics and CeNIDE, Universität Duisburg-Essen — 2Chair of Applied Solid State Physics, Ruhr-Universität Bochum
We investigate tunable transverse rectification in a density-modulated two-dimensinal electron gas (2DEG) at temperatures between 1.8 K and 200 K. The 2DEG is patterned into a Hall bar geometry. Using gate electrodes we induce two stripes of different charge carrier densities running parallel to the channel. The resulting density gradient perpendicular to the channel induces a transverse voltage, which - due to the symmetry of the device - does not change polarity when the current direction is reversed. The experimental results can be reproduced to some extent using a simple ballistic billiard model [1, 2].
To acquire a deeper insight into the physics behind this transverse rectification effect, further experiments and theoretical approaches are presented. For example, we study the voltage probes potentials of an ungated 2DEG-hallbar, where a parabolic source-drain voltage and temperature dependence can be observed. Furthermore, first theoretical results, based on the Boltzmann equation in the relaxation time approximation [3], give further insights into the observed experimental data.
A. Ganczarczyk et al., preprint:arXiv:0804.0689v3 (2009).
A. Ganczarczyk et al., AIP Conf. Proc. 1199, 143 (2009).
S. Rojek, D. Urban, F. Hucht, and J. König, unpublished.