Infrared conductivity of metallic (III,Mn)V ferromagnets

Abstract

We present a theory of the infrared conductivity and absorption coefficients of metallic (III,Mn)V ferromagnetic semiconductors. We find that the conductivity is dominated by inter-valence-band transitions that produce peaks at $\hslash \omega \sim 220\mathrm{meV}$ and obscure the broadened Drude peak. We demonstrate that transverse f-sum rule measurements can be used to extract accurate values for the free carrier density, bypassing the severe characterization difficulties that have till now been created by the large anomalous Hall effect in these materials.

5 pages, 3 figures. Model parameters in figures of previous version did not match caption. Web-page link corrected

References in corpus (2)

• Effects of annealing time on defect-controlled ferromagnetism in Ga1-xMnxAs
• Curie Temperature Trends in (III,Mn)V Ferromagnetic Semiconductors

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• Determining carrier densities in InMnAs by cyclotron resonance
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