Large-scale Monte Carlo study of a realistic lattice model for Ga(1-x)MnxAs.

نویسندگان

  • Yucel Yildirim
  • Gonzalo Alvarez
  • Adriana Moreo
  • Elbio Dagotto
چکیده

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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عنوان ژورنال:
  • Physical review letters

دوره 99 5  شماره 

صفحات  -

تاریخ انتشار 2007