Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.59: Poster

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

Preparation and Characterization of spin filters on InAs — •Jan Jacob, Sebastian von Oehsen, Guido Meier, Toru Matsuyama, and Ulrich Merkt — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

Highly spin-polarized currents are needed for spintronic devices. The injection rate of polarized currents in ferromagnet-semiconductor hybrid devices is poor. Several all-semiconductor three-terminal devices are proposed for semiconductors with a strong and tunable spin-orbit interaction [1,2]. We investigate Y-shaped devices on InAs heterostructures. We prepare sidegates to decrease the number of conductance channels in the two-dimensional electron system. In such a geometry the spin-orbit interaction is supposed to cause currents with opposite spin polarizations in the outgoing leads of the Y-shaped device. We employ electron-beam lithography and reactive-ion etching to obtain structures with minimal channel width of 100 nm and channel length from 500 nm to 1500 nm. These lengths are comparable to the elastic mean free path of the electrons. With two spin filters in series we aim at the detection of a spin-polarized current within a conductivity measurement.

[1] M. Yamamoto, T. Ohtsuki, and B. Kramer, Phys. Rev. B 72, 115321 (2005)

[2] J.I. Ohe, M. Yamamoto, T. Ohtsuki, and J. Nitta, Phys. Rev. B 72, 041308 (2005)