Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1547597 | Physica E: Low-dimensional Systems and Nanostructures | 2006 | 4 Pages |
Abstract
Magnetotransport through one or several quasi-one-dimensional rings, in the presence of the Rashba (RSOI) and Dresselhaus (DSOI) terms of the spin-orbit interaction (SOI) and of a magnetic field B, is investigated. The RSOI field and an effective DSOI field are taken as ER=ER(sinγ1er+cosγ1ez) and ED=ED(sinγ2er+cosγ2ez), their strengths are denoted by α and β, respectively. The exact one-electron eigenvalues and eigenfunctions are obtained and used to evaluate the transmission as a function of α, β, and of the angles γ1,γ2. Because the RSOI term couples the electronic orbit (along the θ direction) with the Pauli matrices Ïz and Ïr while the DSOI term couples it with Ïθ, they affect the electronic spin transport through a ring in distinctly different ways. The resulting transmission shows a considerable structure as a function of the angles γ1 or γ2. The same holds for the transmission, versus α or β, with the SOI present only in one arm of the ring and for that through two rings with the same or different radii. Various results of the literature, valid for β=0, are readily recovered. For weak magnetic fields B⩽1T the influence of the Zeeman term on the transmission, assessed by perturbation theory, is negligible.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
P. Vasilopoulos, X.F. Wang,