Monte Carlo Simulations of Doped, Diluted Magnetic Semiconductors - a System with Two Length Scales

Details Monte Carlo Simulations of Doped, Diluted Magnetic Semiconductors - a System with Two Length Scales Monte Carlo Simulations of Doped, Diluted Magnetic Semiconductors - a System with Two Length Scales

1999-12-21

arxiv.org/abs/cond-mat/9912395v1

Int. J. Mod. Phys. C 10, 1459 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

12 pages, latex, 7 figures; submitted to International Journal of Modern Physics C, Proceedings of the U.S.-Japan Bilateral Se

Scientific paper

We describe a Monte Carlo simulation study of the magnetic phase diagram of diluted magnetic semiconductors doped with shallow impurities in the low concentration regime. We show that because of a wide distribution of interaction strengths, the system exhibits strong quantum effects in the magnetically ordered phase. A discrete spin model, found to closely approximate the quantum system, shows long relaxation times, and the need for specialized cluster algorithms for updating spin configurations. Results for a representative system are presented.

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