TY - JOUR
T1 - Long-range ferromagnetic correlations between Anderson impurities in a semiconductor host
T2 - Quantum Monte Carlo simulations
AU - Bulut, Nejat
AU - Tanikawa, Kazuo
AU - Takahashi, Saburo
AU - Maekawa, Sadamichi
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2007/7/26
Y1 - 2007/7/26
N2 - We study the two-impurity Anderson model for a semiconductor host using the quantum Monte Carlo technique. We find that the impurity spins exhibit ferromagnetic correlations with a range which can be much more enhanced than in a half-filled metallic band. In particular, the range is longest when the Fermi level is located above the top of the valence band and decreases as the impurity bound state becomes occupied. Comparisons with the photoemission and optical absorption experiments suggest that this model captures the basic electronic structure of Ga1-x Mnx As, the prototypical dilute magnetic semiconductor (DMS). These numerical results might also be useful for synthesizing DMS or dilute oxide ferromagnets with higher Curie temperatures.
AB - We study the two-impurity Anderson model for a semiconductor host using the quantum Monte Carlo technique. We find that the impurity spins exhibit ferromagnetic correlations with a range which can be much more enhanced than in a half-filled metallic band. In particular, the range is longest when the Fermi level is located above the top of the valence band and decreases as the impurity bound state becomes occupied. Comparisons with the photoemission and optical absorption experiments suggest that this model captures the basic electronic structure of Ga1-x Mnx As, the prototypical dilute magnetic semiconductor (DMS). These numerical results might also be useful for synthesizing DMS or dilute oxide ferromagnets with higher Curie temperatures.
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U2 - 10.1103/PhysRevB.76.045220
DO - 10.1103/PhysRevB.76.045220
M3 - Article
AN - SCOPUS:34547409985
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 4
M1 - 045220
ER -