Multiple-spin exchange in a two-dimensional Wigner crystal in a magnetic field
Abstract
Multiple-spin exchange constants in a two-dimensional Wigner crystal, in a magnetic field perpendicular to the plane, is calculated with a semiclassical approximation. The field causes an Aharanov-Bohm oscillation in the exchange constants and can change a ferromagnetic exchange constant to an antiferromagnetic one and vice versa, in addition to reducing the magnitude of the exchange constants. The field can destabilize the ferromagnetic ground state and bring about a rich ground state phase diagram.
- Publication:
-
Physical Review B
- Pub Date:
- March 2001
- DOI:
- 10.1103/PhysRevB.63.125340
- Bibcode:
- 2001PhRvB..63l5340H
- Keywords:
-
- 73.21.-b;
- 03.65.Sq;
- 71.10.-w;
- 75.10.-b;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Semiclassical theories and applications;
- Theories and models of many-electron systems;
- General theory and models of magnetic ordering