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| VOLUME 83 | ISSUE 8 |
PAGE 399
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| Spin-orbit lateral superlattices: energy bands and spin polarization in 2DEG
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V. Ya. Demikhovskii, D. V. Khomitsky
Department of Physics, University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia
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PACS: 73.21.Cd, 85.75.-d
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Abstract
The Bloch spinors, energy spectrum and spin density in
energy bands are studied for the two-dimensional electron gas (2DEG) with
Rashba spin-orbit (SO) interaction subject to one-dimensional (1D) periodic
electrostatic potential of a lateral superlattice. The space symmetry
of the Bloch spinors with spin parity is studied. It is shown that
the Bloch spinors at fixed quasimomentum describe the standing
spin waves with the wavelength equal to the superlattice period.
The spin projections in these states have the components both parallel and
transverse to the 2DEG plane. The anticrossing of the energy dispersion curves
due to the interplay between the SO and periodic terms is observed,
leading to the spin flip. The relation between the spin parity and
the interband optical selection rules is discussed, and the effect of
magnetization of the SO superlattice in the presence of external
electric field is predicted.
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