Spin-to-Charge Conversion of Mesoscopic Spin Currents

Details Spin-to-Charge Conversion of Mesoscopic Spin Currents Spin-to-Charge Conversion of Mesoscopic Spin Currents

2010-12-08

arxiv.org/abs/1012.1831v2

Phys. Rev. Lett. 106, 206602 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; references added, a few minor changes

Scientific paper

10.1103/PhysRevLett.106.206602

Recent theoretical investigations have shown that spin currents can be generated by passing electric currents through spin-orbit coupled mesoscopic systems. Measuring these spin currents has however not been achieved to date. We show how mesoscopic spin currents in lateral heterostructures can be measured with a single-channel voltage probe. In the presence of a spin current, the charge current $I_{\rm qpc}$ through the quantum point contact connecting the probe is odd in an externally applied Zeeman field $B$, while it is even in the absence of spin current. Furthermore, the zero field derivative $\partial_B I_{\rm qpc}$ is proportional to the magnitude of the spin current, with a proportionality coefficient that can be determined in an independent measurement. We confirm these findings numerically.

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