Spin transistor action from Onsager reciprocity and SU(2) gauge theory

Autor:	Adagideli, I., Lutsker, V., Scheid, M., Jacquod, Ph., Richter, K.
Rok vydání:	2012
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. Lett. 108, 236601 (2012)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.108.236601
Popis:	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. Comment: 5 pages, 3 figures, RevTeX, submitted to Physical Review Letters
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1201.0466 Zobrazit plný text záznamu View this record from Arxiv