Origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic (Ga,Mn)As: Impurity bands inside the band gap

Abstract

The electronic structure of a prototype dilute magnetic semiconductor (DMS), Ga1-xMnxAs, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the E0 transition from the valence band to the conduction band is negative indicating that the p-d exchange interactions between the p-carriers and d-spin is antiferromagnetic. The negative E0 MCD signal also indicates that the hole-doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of Ga1-xMnxAs.

13 pages, 3 figures

References in corpus (2)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor

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• Thermodynamic and thermoelectric properties of (Ga,Mn)As and related compounds
• $Ab$-$initio$ electronic structure, optical and magneto-optical properties of $MnGaAs$ digital ferromagnetic heterostructures
• Magnetic circular dichroism in GaMnAs: (no) evidence for an impurity band
• A comprehensive study of the magnetic, structural and transport properties of the III-V ferromagnetic semiconductor InMnP
• Impact of Next-Nearest-Neighbor hopping on Ferromagnetism in Diluted Magnetic Semiconductors