Large-Scale Monte Carlo Study of a Realistic Lattice Model for Ga1xMnxAs

Yucel Yildirim, Gonzalo Alvarez, Adriana Moreo, and Elbio Dagotto
Phys. Rev. Lett. 99, 057207 – Published 1 August 2007

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 J1.2eV 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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  • Received 30 November 2006

DOI:https://doi.org/10.1103/PhysRevLett.99.057207

©2007 American Physical Society

Authors & Affiliations

Yucel Yildirim1,2, Gonzalo Alvarez3, Adriana Moreo1, and Elbio Dagotto1

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966-1200, USA and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6032, USA
  • 2Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 3Computer Science and Mathematics Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6032, USA

Comments & Replies

Comment on “Large-Scale Monte Carlo Study of a Realistic Lattice Model for Ga1xMnxAs

Georges Bouzerar and Richard Bouzerar
Phys. Rev. Lett. 100, 229701 (2008)

Moreo and Dagotto Reply:

Adriana Moreo and Elbio Dagotto
Phys. Rev. Lett. 100, 229702 (2008)

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Issue

Vol. 99, Iss. 5 — 3 August 2007

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