Anomalous Spin-Resolved Point-Contact Transmission of Holes due to Cubic Rashba Spin-Orbit Coupling
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2011
- DOI:
- 10.1103/PhysRevLett.106.236601
- arXiv:
- arXiv:1011.2676
- Bibcode:
- 2011PhRvL.106w6601C
- Keywords:
-
- 72.25.-b;
- 71.70.Ej;
- 73.23.Ad;
- 85.75.-d;
- Spin polarized transport;
- Spin-orbit coupling Zeeman and Stark splitting Jahn-Teller effect;
- Ballistic transport;
- Magnetoelectronics;
- spintronics: devices exploiting spin polarized transport or integrated magnetic fields;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages, 3 figures