Physics – Condensed Matter – Materials Science
Scientific paper
2008-12-02
Physics
Condensed Matter
Materials Science
5 pages, 4 figures
Scientific paper
We present a realistic study for electronic and magnetic properties in dilute magnetic semiconductor (Ga,Mn)As. A multi-orbital Haldane-Anderson model parameterized by density-functional calculations is presented and solved with the Hirsch-Fye quantum Monte Carlo algorithm. Results well reproduce experimental results in the dilute limit. When the chemical potential is located between the top of the valence band and an impurity bound state, a long-range ferromagnetic correlations between the impurities, mediated by antiferromagnetic impurity-host couplings, are drastically developed. We observe an anisotropic character in local density of states at the impurity-bound-state energy, which is consistent with the STM measurements. The presented combined approach thus offers a firm starting point for realistic calculations of the various family of dilute magnetic semiconductors.
Arita Ryotaro
Bulut Nejat
Maekawa Sadamichi
Nakamura Kazuma
Ohe Jun-ichiro
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