A prohibition of equilibrium spin currents in multi-terminal ballistic devices

Details A prohibition of equilibrium spin currents in multi-terminal ballistic devices A prohibition of equilibrium spin currents in multi-terminal ballistic devices

2004-11-02

arxiv.org/abs/cond-mat/0411070v1

Phys. Rev. B 71, 153315 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 1 figure; presented at the DARPA SPinS review (#Th-19), San Francisco, CA, October 25-28, 2004

Scientific paper

10.1103/PhysRevB.71.153315

We show that in the multi-terminal ballistic devices with intrinsic spin-orbit interaction connected to normal metal contacts there are no equilibrium spin currents present at any given electron energy. Obviously, this statement holds also after the integration over all occupied states. Based on the proof of this fact, a number of scenarios involving nonequilibrium spin currents is identified and further analyzed. In particular, it is shown that an arbitrary two-terminal device cannot polarize transient current. The same is true for the output terminal of an N-terminal device when all N-1 inputs are connected in parallel.

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