Spin precession, flips, and transmission through a ring: Relation between the spin–orbit interaction strengths and the final spin orientation
✍ Scribed by X.F. Wang; P. Vasilopoulos
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 488 KB
- Volume
- 39
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
We study spin precession and transmission through a mesoscopic ring in the presence of the Rashba and Dresselhaus terms of the spin-orbit interaction (SOI), respectively, of strengths a and b, and of a magnetic field B. The Rashba field, the effective Dresselhaus field as well as B have perpendicular and radial components. The final spin orientations depend importantly on a, b, and B. In the absence of B the outgoing spins trace rings perpendicular to well-defined directions for b ¼ 0 or a ¼ 0. For b ¼ 0 ða ¼ 0Þ incident spins polarized along these well-defined directions exit the ring undeflected. For aaba0 the trace rings become spirals. The values of a and b are related to the final spin orientation. For weak magnetic fields this precession picture does not hold. Spin flips occur when a or b is varied as the angles describing the final spin orientation change drastically in a very narrow range of a or b values in which the total transmission vanishes.