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- W2078096936 abstract "For large size- and chemical-mismatched isovalent semiconductor alloys, such as N and Bi substitution on As sites in GaAs, isovalent defect levels or defect bands are introduced. The evolution of the defect states as a function of the alloy concentration is usually described by the popular phenomenological band anticrossing (BAC) model. Using first-principles band-structure calculations we show that at the impurity limit the N- (Bi)-induced impurity level is above (below) the conduction- (valence-) band edge of GaAs. These trends reverse at high concentration, i.e., the conduction-band edge of ${text{GaAs}}_{1ensuremath{-}x}{text{N}}_{x}$ becomes an N-derived state and the valence-band edge of ${text{GaAs}}_{1ensuremath{-}x}{text{Bi}}_{x}$ becomes a Bi-derived state, as expected from their band characters. We show that this band crossing phenomenon cannot be described by the popular BAC model but can be naturally explained by a simple band broadening picture." @default.
- W2078096936 created "2016-06-24" @default.
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- W2078096936 date "2010-11-17" @default.
- W2078096936 modified "2023-10-09" @default.
- W2078096936 title "Band crossing in isovalent semiconductor alloys with large size mismatch: First-principles calculations of the electronic structure of Bi and N incorporated GaAs" @default.
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- W2078096936 doi "https://doi.org/10.1103/physrevb.82.193204" @default.
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