Ellipsometric study of the Electronic Structure of GaMnAs and LT-GaAs

Abstract

We have measured the optical constants of GaMnAs from 0.62 eV to 6 eV, using spectroscopic ellipsometry. The second derivatives of the dielectric function are examined through a critical point analysis. The E1 critical point shifts to higher energies with increased doping of Mn, while all other critical points appear unaffected. The evolution of the critical points results from the interplay between band gap renormalization from ionized impurities and sp-d hybridization of the Mn induced impurity band and GaAs valence and conductions bands.

arXiv comment21 pages, 8 figures

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• Theory of ferromagnetic (III,Mn)V semiconductors
• Electrodynamics of Correlated Electron Materials
• Ferromagnetic Semiconductors: Moving Beyond (Ga,Mn)As
• Electrodynamics of the vanadium oxides VO2 and V2O3
• Correlated metallic state of vanadium dioxide
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
• Experimental observation of the optical spin transfer torque
• Band structure model of magnetic coupling in semiconductors
• Ferromagnetism in Ga1-xMnxP: evidence for inter-Mn exchange mediated by localized holes within a detached impurity band
• Optical Properties of III-Mn-V Ferromagnetic Semiconductors
• Systematic study of magnetic linear dichroism and birefringence in (Ga,Mn)As
• Electrodynamics of correlated electron matter
• Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets
• Determination of the infrared complex magneto-conductivity tensor in itinerant ferromagnets from Faraday and Kerr measurements
• Magneto-optical properties of (Ga,Mn)As: an ab--initio determination
• On the origin of magnetism in (Ga,Mn)As: from paramagnetic through superparamagnetic to ferromagnetic phase
• Spin dynamics in (III,Mn)V ferromagnetic semiconductors: the role of correlations
• Optical probe of strong correlations in LaNiO${}_3$ thin films
• Optical properties of metallic (III,Mn)V ferromagnetic semiconductors in the infrared to visible range
• Mechanical and Electronic Properties of Ferromagnetic GaMnAs Using Ultrafast Coherent Acoustic Phonons
• Ferromagnetism and infrared electrodynamics of Ga${}_{1-x}$Mn${}_x$As}
• Bandgap narrowing in Mn doped GaAs probed by room-temperature photoluminescence
• All-optical four-state magnetization reversal in (Ga,Mn)As ferromagnetic semiconductors
• Disorder, spin-orbit, and interaction effects in dilute ${\mathrm{Ga}}_{1-x}{\mathrm{Mn}}_x\mathrm{As}$
• Mechanism of photo-excited precession of magnetization in (Ga,Mn)As on the basis of time-resolved spectroscopy
• Dynamics of Impurity and Valence Bands in GaMnAs within the Dynamical Mean Field Approximation
• Transition Temperature of a Magnetic Semiconductor with Angular Momentum j
• $Ab$-$initio$ electronic structure, optical and magneto-optical properties of $MnGaAs$ digital ferromagnetic heterostructures
• Theory of optical conductivity for dilute GaMnAs