We investigate the effect of mass anisotropy on the magnetic structure of the Wigner crystal of low-density electron systems in two dimensions at T=0. The multiparticle exchange frequencies are calculated with effective mass anisotropy, with and without concomitant lattice distortions. Numerical diagonalization of small lattice sizes with two-, three-, and four-spin exchange terms shows a transition from a ferromagnetic to an antiferromagnetic ground state with increasing mass anisotropy. We map out this transition at various electron densities.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Nov 24 2006|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics