Non-Drude Optical Conductivity of (III,Mn)V Ferromagnetic Semiconductors

Abstract

We present a numerical model study of the zero-temperature infrared optical properties of (III,Mn)V diluted magnetic semiconductors. Our calculations demonstrate the importance of treating disorder and interaction effects simultaneously in modelling these materials. We find that the conductivity has no clear Drude peak, that it has a broadened inter-band peak near 220 meV, and that oscillator weight is shifted to higher frequencies by stronger disorder. These results are in good qualitative agreement with recent thin film absorption measurements. We use our numerical findings to discuss the use of f-sum rules evaluated by integrating optical absorption data for accurate carrier-density estimates.

7 pages, 3 figures

References in corpus (10)

• Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductors
• Theory of Magnetic Anisotropy in III_{1-x}Mn_{x}V Ferromagnets
• Effects of annealing time on defect-controlled ferromagnetism in Ga1-xMnxAs
• High Curie temperature GaMnAs obtained by resistance-monitored annealing
• Saturated Ferromagnetism and Magnetization Deficit in Optimally Annealed (Ga,Mn)As Epilayers
• Boltzmann theory of engineered anisotropic magnetoresistance in (Ga,Mn)As
• Spectroscopic determination of hole density in the ferromagnetic semiconductor Ga${}_{1-x}$Mn${}_x$As
• Noncollinear Ferromagnetism in (III,Mn)V Semiconductors
• Infrared conductivity of metallic (III,Mn)V ferromagnets
• Optical Conductivity of Ferromagnetic Semiconductors

Cited by in corpus (15)

• Anomalous Hall effect
• Theory of ferromagnetic (III,Mn)V semiconductors
• Spin-dependent phenomena and device concepts explored in (Ga,Mn)As
• On the character of states near the Fermi level in (Ga,Mn)As: impurity to valence band crossover
• Optical Properties of III-Mn-V Ferromagnetic Semiconductors
• Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As
• Single-Band Model for Diluted Magnetic Semiconductors: Dynamical and Transport Properties and Relevance of Clustered States
• Systematic study of magnetic linear dichroism and birefringence in (Ga,Mn)As
• Infrared magneto-optical properties of (III,Mn)V ferromagetic semiconductors
• Temperature and magnetization-dependent band-gap renormalization and optical many-body effects in diluted magnetic semiconductors
• Optical properties of metallic (III,Mn)V ferromagnetic semiconductors in the infrared to visible range
• Electronic and optical properties of ferromagnetic GaMnAs in a multi-band tight-binding approach
• Theory of optical conductivity for dilute GaMnAs
• Dielectric Function of Diluted Magnetic Semiconductors in the Infrared Regime
• Perspectives in spintronics: magnetic resonant tunneling, spin-orbit coupling, and GaMnAs