Persistent spin current in a spin-orbit coupling/normal hybrid ring

Details Persistent spin current in a spin-orbit coupling/normal hybrid ring Persistent spin current in a spin-orbit coupling/normal hybrid ring

2006-05-31

arxiv.org/abs/cond-mat/0605748v1

Phys. Rev. Lett. 98 196801 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

We investigate the equilibrium property of a mesoscopic ring with spin orbit (SO) interaction. It is well known that for a normal mesoscopic ring threaded by a magnetic flux, the electron acquires a Berry phase that induces the persistent (charge) current. Similarly, the spin of electron acquires a spin Berry phase traversing the ring with SO interaction. It is this spin Berry phase that induces a persistent spin current. To demonstrate its existence, we calculate the persistent spin current without accompanying charge current in the normal region in a hybrid mesoscopic ring. We point out that this persistent spin current describes the real spin motion and can be observed experimentally.

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