Large-scale Monte Carlo study of a realistic lattice model for Ga(1-x)MnxAs.
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 J approximately 1.2 eV the MC Curie temperature and magnetization curves agree with experiments for x = 8.5% annealed samples. Mn-doped GaSb and GaP are also briefly discussed.
Yildirim
Yucel
Y
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966-1200, USA.
Alvarez
Gonzalo
G
Moreo
Adriana
A
Dagotto
Elbio
E