Phys. Rev. Lett. 99, 057207 (2007) [4 pages]Large-Scale Monte Carlo Study of a Realistic Lattice Model for Ga1-xMnxAsReceived 30 November 2006; revised 9 February 2007; published 1 August 2007 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∼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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.057207
DOI:
10.1103/PhysRevLett.99.057207
PACS:
75.50.Pp, 71.10.Fd, 72.25.Dc
See AlsoComment: Georges Bouzerar and Richard Bouzerar, Comment on “Large-Scale Monte Carlo Study of a Realistic Lattice Model for Ga1-xMnxAs”, Phys. Rev. Lett. 100, 229701 (2008). Reply: Adriana Moreo and Elbio Dagotto, Moreo and Dagotto Reply:, Phys. Rev. Lett. 100, 229702 (2008). |
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