Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 29: Spinabh
ängiger Transport I

HL 29.9: Vortrag

Mittwoch, 10. März 2004, 17:15–17:30, H13

Rashba spin precession of two-dimensional holes — •Michele Governale^1,2, Marco G. Pala^3,2, Jürgen König^4,2, and Ulrich Zülicke^5,2 — ¹Scuola Normale Superiore, Pisa, Italy — ²Institut für Theoretische Festkörperphysik, Universität Karlsruhe, Germany — ³Dipartimento di Ingegneria dell’Informazione, Università degli studi di Pisa, Italy — ⁴Institut für Theoretische Physik III, Ruhr-Universität Bochum, Germany — ⁵Institute of Fundamental Sciences, Massey University, New Zealand

Spin-orbit coupling due to structural inversion asymmetry plays an important role in the field of phase-coherent spintronics.

We present a study of spin precession due to Rashba spin splitting[1] of holes[2] in semiconductor quantum wells. Based on a simple analytical expression that we derive for the current modulation in a broad class of experimental situations of ferromagnet/nonmagnetic semiconductor/ferromagnet hybrid structures, we conclude that the Datta-Das spin transistor[3] (i) is feasible with holes and (ii) its functionality is not affected by integration over injection angles.

The current modulation shows a universal oscillation period, irrespective of the different forms of the Rashba Hamiltonian for electrons and holes. The analytic formulas approximate extremely well exact numerical calculations of a more elaborate Kohn–Luttinger model.

[1] E. I. Rashba, Fiz. Tverd. Tela (Leningrad) 2, 1224 (1960) [Sov. Phys. Solid State 2, 1109 (1960)].

[2] R. Winkler, Phys. Rev. B 62, 4245 (2000).