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Title: On the nature of the Mn-related states in the band structure of (Ga,Mn)As alloys via probing the E{sub 1} and E{sub 1} + Δ{sub 1} optical transitions

The dilute (Ga,Mn)As became a model ferromagnetic semiconductor, however there is still a disagreement on the source of its magnetism. In this paper, we verify the ellipsometric results and compare them with more precise photoreflectance method, which gives an important insight into the interaction of the Mn-related states with the ones of GaAs valence band. No spectral shifts observed for the E{sub 1} and E{sub 1} + Δ{sub 1} interband transitions in highly doped and annealed (Ga,Mn)As epitaxial layers indicate that the coupling between a detached Mn impurity band and the valence band does not occur. Our findings are supported by the characterizations of the (Ga,Mn)As epitaxial layers with the high resolution transmission electron microscopy and magnetization measurements.
Authors:
; ; ;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [3]
  1. Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin (Poland)
  2. Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław (Poland)
  3. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw (Poland)
  4. (Sweden)
  5. Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warsaw (Poland)
  6. Faculty of Chemistry, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 3, 20-031 Lublin (Poland)
Publication Date:
OSTI Identifier:
22311149
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALLOYS; ANNEALING; COUPLING; DOPED MATERIALS; ELECTRONIC STRUCTURE; ENERGY-LEVEL TRANSITIONS; EPITAXY; FERROMAGNETIC MATERIALS; GALLIUM ARSENIDES; IMPURITIES; INTERACTIONS; LAYERS; MAGNETIC SEMICONDUCTORS; MAGNETISM; MAGNETIZATION; MANGANESE COMPOUNDS; RESOLUTION; SPECTRAL SHIFT; TRANSMISSION ELECTRON MICROSCOPY; VALENCE