Anomalous spin-resolved point-contact transmission of holes due to cubic Rashba spin-orbit coupling

Details Anomalous spin-resolved point-contact transmission of holes due to cubic Rashba spin-orbit coupling Anomalous spin-resolved point-contact transmission of holes due to cubic Rashba spin-orbit coupling

2010-11-11

arxiv.org/abs/1011.2676v2

Phys. Rev. Lett. 106, 236601 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

Evidence is presented for the finite wave vector crossing of the two lowest one-dimensional spin-split subbands in quantum point contacts fabricated from two-dimensional hole gases with strong spin-orbit interaction. This phenomenon offers an elegant explanation for the anomalous sign of the spin polarization filtered by a point contact, as observed in magnetic focusing experiments. Anticrossing is introduced by a magnetic field parallel to the channel or an asymmetric potential transverse to it. Controlling the magnitude of the spin-splitting affords a novel mechanism for inverting the sign of the spin polarization.

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