Quantum Anomalous Hall Effect in Hg1-yMnyTe Quantum Wells
Abstract
The quantum Hall effect is usually observed when a two-dimensional electron gas is subjected to an external magnetic field, so that their quantum states form Landau levels. In this work we predict that a new phenomenon, the quantum anomalous Hall effect, can be realized in Hg1-yMnyTe quantum wells, without an external magnetic field and the associated Landau levels. This effect arises purely from the spin polarization of the Mn atoms, and the quantized Hall conductance is predicted for a range of quantum well thickness and the concentration of the Mn atoms. This effect enables dissipationless charge current in spintronics devices.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2008
- DOI:
- 10.1103/PhysRevLett.101.146802
- arXiv:
- arXiv:0802.2711
- Bibcode:
- 2008PhRvL.101n6802L
- Keywords:
-
- 73.43.-f;
- 72.25.Dc;
- 75.50.Pp;
- 85.75.-d;
- Quantum Hall effects;
- Spin polarized transport in semiconductors;
- Magnetic semiconductors;
- Magnetoelectronics;
- spintronics: devices exploiting spin polarized transport or integrated magnetic fields;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 5 pages, 3 figures. For high resolution figures see final published version when available