Volume 65, Number 6, March 2004
|Page(s)||850 - 856|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 March 2004|
Universal Rashba spin precession of two-dimensional electrons and holes
Dipartimento di Ingegneria dell'Informazione - via Diotisalvi 2, I-56126 Pisa, Italy
2 Institut für Theoretische Festkörperphysik, Universität Karlsruhe D-76128 Karlsruhe, Germany
Accepted: 5 January 2004
We study spin precession due to Rashba spin splitting of electrons and holes 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 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.
PACS: 85.75.Hh – Spin polarized field effect transistors / 72.25.-b – Spin polarized transport / 73.23.Ad – Ballistic transport
© EDP Sciences, 2004
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