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Magnetic properties of diluted magnetic semiconductors: Quantum Monte Carlo approach |
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| Authors: | Jun-ichiro Ohe Yoshihiro Tomoda Nejat Bulut Ryotaro Arita Kazuma Nakamura Sadamichi Maekawa |
| Institution: | 1. Department of Chemical and Biomolecular Engineering, 182 Fitzpatrick Hall, University of Notre Dame, Notre Dame, IN 46556, USA;2. The Gene and Linda Voiland School of Chemical and Bioengineering, Washington State University, Pullman, WA 99164, USA;3. Department of Physics and Astronomy, Washington State University, Pullman, WA 99164, USA;4. Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA;1. Consejo Nacional de Investigaciones Científicas y Técnicas (Conicet) and Centro Atómico Bariloche, 8400 Bariloche, Argentina;2. Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain;3. CNR-IOM, TASC Laboratory, AREA Science Park — Basovizza, SS14, km 163.5, IT-34149 Trieste, Italy;4. Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain |
| Abstract: | The magnetic correlation between magnetic impurities in semiconductors is investigated by performing the quantum Monte Carlo (QMC) simulation. The Anderson Hamiltonian with the realistic parameters obtained by the local density approximation (LDA) calculation is employed. The LDA calculation gives a dispersion of the host (GaAs) electron and the mixing energy between host and magnetic impurity (Mn). The mixing between host and impurity electrons generates the impurity bound state in the energy gap of semiconductors. The long range ferromagnetic coupling is observed when the Fermi energy locates between the band edge and the impurity bound state. The ferromagnetic coupling is enhanced by decreasing temperature. |
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