TY - JOUR
T1 - Nanoscale ferromagnetism in nonmagnetic doped semiconductors
AU - Nielsen, Erik
AU - Bhatt, R. N.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2007/10/23
Y1 - 2007/10/23
N2 - While ferromagnetism at relatively high temperatures is seen in diluted magnetic semiconductors such as Ga1-x Mnx As, doped semiconductors without magnetic ions have not shown evidence for ferromagnetism. Using a generalized disordered Hubbard model designed to characterize hydrogenic centers in semiconductors, we find that such systems may also exhibit a ferromagnetic ground state, at least on the nanoscale. This is found most clearly in a regime inaccessible to bulk systems, but attainable in quantum dots as well as heterostructures. We present numerical results demonstrating the occurrence of high spin ground states in both lattice and positionally disordered systems. We examine how the magnetic phases are affected by characteristics of real doped semiconductors, such as positional disorder and electron-hole asymmetry.
AB - While ferromagnetism at relatively high temperatures is seen in diluted magnetic semiconductors such as Ga1-x Mnx As, doped semiconductors without magnetic ions have not shown evidence for ferromagnetism. Using a generalized disordered Hubbard model designed to characterize hydrogenic centers in semiconductors, we find that such systems may also exhibit a ferromagnetic ground state, at least on the nanoscale. This is found most clearly in a regime inaccessible to bulk systems, but attainable in quantum dots as well as heterostructures. We present numerical results demonstrating the occurrence of high spin ground states in both lattice and positionally disordered systems. We examine how the magnetic phases are affected by characteristics of real doped semiconductors, such as positional disorder and electron-hole asymmetry.
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U2 - 10.1103/PhysRevB.76.161202
DO - 10.1103/PhysRevB.76.161202
M3 - Article
AN - SCOPUS:35448957620
SN - 1098-0121
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 16
M1 - 161202
ER -