Mechanical measurement of equilibrium spin currents in the Rashba medium

Details Mechanical measurement of equilibrium spin currents in the Rashba medium Mechanical measurement of equilibrium spin currents in the Rashba medium

2007-07-15

arxiv.org/abs/0707.2197v1

Phys. Rev. Lett. 99, 266602 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.99.266602

We demonstrate that an equilibrium spin current in a 2D electron gas with Rashba spin-orbit interaction (Rashba medium) results in a mechanical torque on a substrate near an edge of the medium. If the substrate is a cantilever, the mechanical torque displaces the free end of the cantilever. The effect can be enhanced and tuned by a magnetic field. Observation of this displacement would be an effective method to prove existence of equilibrium spin currents. The analysis of edges of the Rashba medium demonstrates the existence of localized edge states. They form a 1D continuum of states. This suggests a new type of quantum wire: spin-orbit quantum wire.

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