Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors

Details Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors

2008-06-10

arxiv.org/abs/0806.1753v1

Phys. Rev. Lett. 101, 157203 (2008)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.157203

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 theoretical framework incorporates real-space Green's functions to properly incorporate spatial correlations in the disordered conduction band and valence band electronic structure, and includes extended and localized electronic states on an equal basis. Our findings reconcile unusual trends in the experimental magnetic circular dichroism in III-V DMSs with the antiferromagnetic p-d exchange interaction between a magnetic dopant spin and its host.

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