Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Spin controlled transport I

HL 12.10: Vortrag

Dienstag, 24. März 2009, 12:15–12:30, BEY 81

All-electrical detection of the relative strength of Rashba and Dresselhaus spin-orbit interaction in quantum wires — •Matthias Scheid1,2, Makoto Kohda1, Yoji Kunihashi1, Klaus Richter2, and Junsaku Nitta11Graduate School of Engineering, Tohoku University, 6-6-02 Aramaki-Aza Aoba, Aoba-ku, Sendai 980-8579, Japan — 2Institut für theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

We numerically study the conductance of diffusive quantum wires with Rashba and/or Dresselhaus spin-orbit interaction based on the Landauer formalism. We confirm previous results showing the suppression of weak antilocalization in narrow quantum wires [1] or at equal strength of Rashba and Dresselhaus spin-orbit interaction [2].
As a main result, we propose a method to determine the relative strength of Rashba and Dresselhaus spin-orbit interaction from transport measurements without the need of fitting parameters. To this end, we make use of the conductance anisotropy in narrow quantum wires with respect to the directions of an in-plane magnetic field, the quantum wire and the crystal orientation. We show the applicability of the method in a wide range of parameters (elastic mean free path, spin-orbit interaction strength, Fermi energy).
Th. Schäpers, V. A. Guzenko, M. G. Pala, U. Zülicke, M. Governale, J. Knobbe and H. Hardtdegen, Phys. Rev. B 74, 081301 (2006).
F. G. Pikus and G. E. Pikus, Phys. Rev. B 51, 16928 (1995).
M. Scheid, M. Kohda, Y. Kunihashi, K. Richter and J. Nitta, Phys. Rev. Lett. (in press).

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