Combined Approach of Density Functional Theory and Quantum Monte Carlo Method to Electron Correlation in Dilute Magnetic Semiconductors
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概要
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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.
- 2009-08-15
著者
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Arita Ryotaro
Department Of Applied Physics University Of Tokyo:crest Jst
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Nakamura Kazuma
Department Of Applied Physics University Of Tokyo
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Maekawa Sadamichi
Institute For Iron And Other Metals Tohoku University
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Nakamura Kazuma
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656
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Ohe Jun-ichiro
Institute for Materials Research, Tohoku University, Sendai 980-8577
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Tomoda Yoshihiro
Institute for Materials Research, Tohoku University, Sendai 980-8577
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Bulut Nejat
Institute for Materials Research, Tohoku University, Sendai 980-8577
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