Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As

Abstract

We report on a systematic study of optical properties of (Ga,Mn)As epilayers spanning the wide range of accessible substitutional Mn_Ga dopings. The growth and post-growth annealing procedures were optimized for each nominal Mn doping in order to obtain films which are as close as possible to uniform uncompensated (Ga,Mn)As mixed crystals. We observe a broad maximum in the mid-infrared absorption spectra whose position exhibits a prevailing blue-shift for increasing Mn-doping. In the visible range, a peak in the magnetic circular dichroism blue shifts with increasing Mn-doping. These observed trends confirm that disorder-broadened valence band states provide a better one-particle representation for the electronic structure of high-doped (Ga,Mn)As with metallic conduction than an energy spectrum assuming the Fermi level pinned in a narrow impurity band.

22 pages, 14 figures

References in corpus (9)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
• On the character of states near the Fermi level in (Ga,Mn)As: impurity to valence band crossover
• Origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic (Ga,Mn)As: Impurity bands inside the band gap
• Optical Properties of III-Mn-V Ferromagnetic Semiconductors
• Microscopic analysis of the valence band and impurity band theories of (Ga,Mn)As
• Metal-insulator transition by isovalent anion substitution in Ga1-xMnxAs: Implications to ferromagnetism
• Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by sub-gap magneto-optical spectroscopy
• Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors

Cited by in corpus (20)

• Dilute ferromagnetic semiconductors: Physics and spintronic structures
• Spin-dependent phenomena and device concepts explored in (Ga,Mn)As
• Experimental observation of the optical spin transfer torque
• Experimental observation of the optical spin-orbit torque
• Systematic study of magnetic linear dichroism and birefringence in (Ga,Mn)As
• Direct measurement of the three dimensional magnetization vector trajectory in GaMnAs by a magneto-optical pump-and-probe method
• Detection of stacking faults breaking the [110]/[1-10] symmetry in ferromagnetic semiconductors (Ga,Mn)As and (Ga,Mn)(As,P)
• Precise tuning of the Curie temperature of (Ga,Mn)As-based magnetic semiconductors by hole compensation: Support for valence-band ferromagnetism
• Anomalous Fermi level behavior in GaMnAs at the onset of ferromagnetism
• Ferromagnetism and infrared electrodynamics of Ga${}_{1-x}$Mn${}_x$As}
• Electronic- and band-structure evolution in low-doped (Ga,Mn)As
• High Precision Magnetic Linear Dichroism Measurements in (Ga,Mn)As
• Effect of low-temperature annealing on the electronic- and band-structure of (Ga,Mn)As epitaxial layers
• Bandgap narrowing in Mn doped GaAs probed by room-temperature photoluminescence
• Thermodynamic and thermoelectric properties of (Ga,Mn)As and related compounds
• Quantum kinetic equations for the ultrafast spin dynamics of excitons in diluted magnetic semiconductor quantum wells after optical excitation
• Electronic structure of (Ga,Mn)As revisited
• Infrared conductivity of hole accumulation and depletion layers in (Ga,Mn)As- and (Ga,Be)As-based electric field-effect devices
• Establishing micromagnetic parameters of ferromagnetic semiconductor (Ga,Mn)As
• Investigation of Optical Spin Transfer Torque in Ferromagnetic Semiconductor GaMnAs by Magneto-Optical Pump-and-Probe Method