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 Nitta1 — 1Graduate 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).