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Large-scale Monte Carlo study of a realistic lattice model for Ga(1-x)MnxAs
Yucel Yildirim1, Gonzalo Alvarez, Adriana Moreo
1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966-1200, USA.
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 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.
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