Precessionless spin transport wire confined in quasi-two-dimensional electron systems

摘要

We demonstrate that in an inversion-asymmetric two-dimensional electronsystem 2DES with both Rashba and Dresselhaus spin-orbit couplings taken intoaccount, certain transport directions on which no spin precession occurs can befound when the injected spin is properly polarized. By analyzing theexpectation value of spin with respect to the injected electron state on eachspace point in the 2DES, we further show that the adjacent regions withtechnically reachable widths along these directions exhibit nearly conservedspin. Hence a possible application in semiconductor spintronics, namely,precessionless spin transport wire, is proposed.