Ballistic spin-polarized transport and Rashba spin precession in semiconductor nanowires
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- 22 June 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 64 (2) , 024426
- https://doi.org/10.1103/physrevb.64.024426
Abstract
We present numerical calculations of the ballistic spin-transport properties of quasi-one-dimensional wires in the presence of the spin-orbit (Rashba) interaction. A tight-binding analog of the Rashba Hamiltonian that models the Rashba effect is used. By varying the robustness of the Rashba coupling and the width of the wire, weak- and strong-coupling regimes are identified. Perfect electron-spin modulation is found for the former regime, regardless of the incident Fermi energy and mode number. In the latter however, the spin conductance has a strong energy dependence due to a nontrivial subband intermixing induced by the strong Rashba coupling. This would imply a strong suppression of the spin modulation at higher temperatures and source-drain voltages. The results may be of relevance for the implementation of quasi-one-dimensional spin-transistor devices.Keywords
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