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Photoreflectance study of the fundamental optical properties of (Ga,Mn) As epitaxial films

Författare:
  • O. Yastrubchak
  • J. Zuk
  • H. Krzyzanowska
  • J. Z. Domagala
  • T. Andrearczyk
  • Janusz Sadowski (Dr)
  • T. Wosinski
Publiceringsår: 2011
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review B
Volym: 83
Nummer: 24
Dokumenttyp: Artikel
Förlag: Amer Physical Soc

Sammanfattning

Fundamental optical properties of thin films of the (Ga,Mn) As diluted ferromagnetic semiconductor with low (1%-2%) and high (4%-6%) Mn content and of a reference GaAs film, grown by low-temperature molecular-beam epitaxy, have been investigated by photoreflectance (PR) spectroscopy. In addition, the films were subjected to complementary characterization by means of superconducting quantum interference device magnetometry, Raman spectroscopy, and high-resolution x-ray diffractometry. Thorough full-line-shape analysis of the PR spectra, which enabled determination of the E-0 electronic transition in (Ga,Mn) As, revealed significant differences between the energy band structures in the vicinity of the Gamma point of the Brillouin zone in the investigated (Ga,Mn) As films. In view of the experimental results obtained, the evolution of the valence band structure in (Ga,Mn) As with increasing Mn content is discussed, pointing to a merging of the Mn-related impurity band with the host GaAs valence band for high Mn content.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 1098-0121

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