Magnetic circular dichroism in GaMnAs: (no) evidence for an impurity band

Details Magnetic circular dichroism in GaMnAs: (no) evidence for an impurity band Magnetic circular dichroism in GaMnAs: (no) evidence for an impurity band

2009-04-18

arxiv.org/abs/0904.2864v2

Physics

Condensed Matter

Materials Science

4 pages, 3 figues

Scientific paper

10.1103/PhysRevB.80.161201

Magneto-optical properties of the ferromagnetic semiconductor GaMnAs are studied in a material specific multi-band tight-binding approach. Two realistic models are compared: one has no impurity band while the other shows an impurity band for low Mn concentrations. The calculated magnetic circular dichroism (MCD) is positive for both models proving that, unlike previously asserted, the observed positive MCD signal is inconclusive as to the presence or absence of an impurity band in GaMnAs. The positive MCD is due to the antiferromagnetic p-d coupling and the transitions into the conduction band.

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