Abstract
Mn-doped GaAs is studied with a real-space Hamiltonian on an fcc lattice that reproduces the valence bands of undoped GaAs. Large-scale Monte Carlo (MC) simulations on a Cray XT3, using up to a thousand nodes, were needed. Spin-orbit interaction and the random distribution of the Mn ions are considered. The hopping amplitudes are functions of the GaAs Luttinger parameters. At the realistic coupling the MC Curie temperature and magnetization curves agree with experiments for annealed samples. Mn-doped GaSb and GaP are also briefly discussed.
- Received 30 November 2006
DOI:https://doi.org/10.1103/PhysRevLett.99.057207
©2007 American Physical Society