Valley-Polarized Quantum Anomalous Hall Effect in Silicene
Abstract
We find theoretically a new quantum state of matter—the valley-polarized quantum anomalous Hall state in silicene. In the presence of Rashba spin-orbit coupling and an exchange field, silicene hosts a quantum anomalous Hall state with Chern number C =2. We show that through tuning the Rashba spin-orbit coupling, a topological phase transition results in a valley-polarized quantum anomalous Hall state, i.e., a quantum state that exhibits the electronic properties of both the quantum valley Hall state (valley Chern number Cv=3) and quantum anomalous Hall state with C =-1. This finding provides a platform for designing dissipationless valleytronics in a more robust manner.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2014
- DOI:
- 10.1103/PhysRevLett.112.106802
- arXiv:
- arXiv:1304.8076
- Bibcode:
- 2014PhRvL.112j6802P
- Keywords:
-
- 73.43.-f;
- 71.70.Ej;
- 73.22.-f;
- 85.75.-d;
- Quantum Hall effects;
- Spin-orbit coupling Zeeman and Stark splitting Jahn-Teller effect;
- Electronic structure of nanoscale materials: clusters nanoparticles nanotubes and nanocrystals;
- Magnetoelectronics;
- spintronics: devices exploiting spin polarized transport or integrated magnetic fields;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- Phys. Rev. Lett. 112,106802 (2014)