Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.227201
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Funding
- EU [FP7-215368 SemiSpinNet, FP7-214499 NAMASTE]
- Czech Republic Grants [KAN400100652, LC510, MEB020928]
- Preamium Academiae [AV0Z10100521, MSM0021620834, MSM0021620857]
- Charles University [GACR 202/09/H041, SVV-2010-261306]
- U.S. NSF-MRSEC [DMR-0820414, ONR-N000140610122, DMR-0547875]
- SWAN-NRI
- Research Corporation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820414] Funding Source: National Science Foundation
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We report on a systematic study of optical properties of (Ga,Mn)As epilayers spanning the wide range of accessible MnGa dopings. The material synthesis was 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 blueshift for increasing Mn doping. In the visible range, a peak in the magnetic circular dichroism also shifts with increasing Mn doping. The results are consistent with the description of ferromagnetic (Ga,Mn)As based on the microscopic valence band theory. They also imply that opposite trends seen previously in the optical data on a limited number of samples are not generic and cannot serve as an experimental basis for postulating the impurity band model of ferromagnetic (Ga,Mn)As
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