Spin transistor action from Onsager reciprocity and SU(2) gauge theory
Mesoscale and Nanoscale Physics
2012-07-16 v1
Abstract
We construct a local gauge transformation to show how, in confined systems, a generic, weak nonhomogeneous SU(2) spin-orbit Hamiltonian reduces to two U(1) Hamiltonians for spinless fermions at opposite magnetic fields, to leading order in the spin-orbit strength. Using an Onsager relation, we further show how the resulting spin conductance vanishes in a two-terminal setup, and how it is turned on by either weakly breaking time-reversal symmetry or opening additional transport terminals. We numerically check our theory for mesoscopic cavities as well as Aharonov-Bohm rings.
Keywords
Cite
@article{arxiv.1201.0466,
title = {Spin transistor action from Onsager reciprocity and SU(2) gauge theory},
author = {I. Adagideli and V. Lutsker and M. Scheid and Ph. Jacquod and K. Richter},
journal= {arXiv preprint arXiv:1201.0466},
year = {2012}
}
Comments
5 pages, 3 figures, RevTeX, submitted to Physical Review Letters