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arXiv · 1011.2676

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

Stefano Chesi·Gabriele F. Giuliani·L. P. Rokhinson·L. N. Pfeiffer·K. W. West
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Abstract

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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Stefano Chesi, Gabriele F. Giuliani, L. P. Rokhinson, L. N. Pfeiffer, K. W. West. 2011-06-11. Anomalous spin-resolved point-contact transmission of holes due to cubic Rashba spin-orbit coupling. https://doi.org/10.1103/physrevlett.106.236601

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