Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.1: Poster

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

Weak Localization and Spin Splitting in Inversion Layers on p-type InAs — •Christopher Schierholz, Toru Matsuyama, Ulrich Merkt, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11c, 20355 Hamburg, Germany

We have examined the magnetoconductivity of quasi two-dimensional electron systems in inversion layers on p-type InAs single crystals. Pronounced features of weak localization and antilocalization at low and beating patterns in SdH oscillations at high magnetic fields are observed. The low field data is almost perfectly described by the theory of Iordanskii, Lyanda-Geller and Pikus [1]. With this we obtain the spin splitting and the Rashba parameter of the ground electric subband as a function of the electron density [2]. In addition we determine the spin splitting and the Rashba parameter from the high field data by FFT analysis. The dependence of the Rashba parameter on the total carrier density is found to differ for low and high fields: the low field results agree well with band-structure calculations by Lamari [3]. The high field results are of the same order of magnitude but show a quite different dependence on the electron density and thus a strong deviation from the theoretical predictions.

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

[2] C. Schierholz, T. Matsuyama, U. Merkt, and G. Meier, Phys. Rev. B 70, (December 15th, 2004).

[3] S. Lamari, Phys. Rev. B 67, 165329 (2003).