Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors
The magnetic circular dichroism of III-V diluted magnetic semiconductors, calculated within a theoretical framework suitable for highly disordered materials, is shown to be dominated by optical transitions between the bulk bands and an impurity band formed from magnetic dopant states. The real-space Green's functions incorporate spatial correlations in the disordered conduction band and valence-band electronic structure, and include extended and localized states on an equal basis. Our findings reconcile unusual trends in the experimental magnetic circular dichroism in III-V diluted magnetic semiconductors with the antiferromagnetic p-d exchange interaction between a magnetic dopant spin and its host.
Physical Review Letters
AMERICAN PHYSICAL SOCIETY
Digital Object Identifier (DOI)
Tang, Jian-Ming and Flatte, Michael E., "Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors" (2008). Physical Review Letters. 140.
© 2008 The American Physical Society