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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.2: Poster

Freitag, 4. März 2005, 16:30–19:00, Poster TU E

Spin-Orbit Interaction in two- and one-dimensional InAs Heterostructures — •Sebastian von Oehsen, Christopher Schierholz, Guido Meyer, Toru Matsuyama, and Ulrich Merkt — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany

In spintronic devices like the spin transistor [1] the spin of the electron is controlled within a one-dimensional channel by the Rashba effect [2]. InAs heterostructures have a strong and tunable spin-orbit interaction and are thus an interesting material for such a device.

We investigate spin-orbit interaction in modulation-doped InAs heterostructures with two-dimensional electron systems by two transport experiments. First, the tunability of spin-orbit interaction is investigated in a two-dimensional channel: in low fields weak antilocalization is observed and analyzed according to Ref.[3], in high fields beating patterns of Shubnikov-de Haas oscillations are recorded. For the second experiment the heterostructures are laterally confined. With these quantum point-contacts we aim at the determination of the influence of spin-orbit interaction on the quantized conductance of a one dimensional channel.

[1] S. Datta and B. Das, Appl. Phys. Lett. 56, 665 (1990)

[2] M. Governale and U. Zülicke, Phys. Rev. B 66, 073311 (2002)

[3] S. Iordanskii, Y. Lyanda-Geller, and G. Pikus, JETP Lett. 60, 206 (1994)