UC San Diego
Ellipsometric study of the electronic structure of Ga1-xMnxAs and low-temperature GaAs
- Author(s): Burch, Kenneth S
- Stephens, J
- Kawakami, R K
- Awschalom, D D
- Basov, D N
- et al.
Published Web Locationhttp://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PRBMDO000070000020205208000001&idtype=cvips
We have measured the optical constants of Ga1-xMnxAs from 0.62 to 6 eV, using spectroscopic ellipsometry. The second derivatives of the dielectric function are examined through a critical point analysis, allowing us to inspect interband transitions from different points in k space. The evolution of the band structure over a broad doping range is determined. Specifically, the E-1 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 due to ionized impurities and sp-d hybridization of the Mn induced impurity band with GaAs valence and conductions bands.
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