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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 2006 The American Physical Society
- ISSN
- 1550-235X
- DOI
- 10.1103/PhysRevB.74.233306
- Publisher site
- See Article on Publisher Site
Abstract
We study two-terminal hole spin transport in a p -type, light-hole–heavy-hole coupled, quantum-well system under the influence of Rashba spin-orbit interaction. An expression for the spin polarization of the outgoing hole flux is derived. It is shown that the in-plane spin polarization vanishes identically whenever the outgoing lead supports only heavy-hole channels. This result is independent of the details of the system. By analyzing the symmetries of the system, constraints on the spin-dependent transmission amplitudes are derived. It is shown that under time-reversal symmetry, the total hole spin polarization vanishes whenever the outgoing lead supports only one spin-degenerate hole channel, which is also independent of the details of the system. It is further shown that generally it is difficult to achieve spin polarized currents from a laterally defined Rashba hole device without breaking its transverse reflection symmetry.
Journal
Physical Review B – American Physical Society (APS)
Published: Dec 15, 2006