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• W1987192755 endingPage "17560" @default.
• W1987192755 startingPage "17551" @default.
• W1987192755 abstract "Raman-scattering experiments performed on n-type GaAs samples, doped with Te, Si, and S impurities, as a function of hydrostatic pressure in the indirect-gap range 4--9 GPa, reveal the bistable character of the related impurity level under optical illumination. A numerical simulation of our results shows that the negative-U model of Chadi and Chang is valid for reproducing the experimental data at low pressure. However, at very high pressures beyond 5--6 GPa, a positive-U description involving a small lattice relaxation is necessary to reproduce results for Te- and Si-doped samples. This demonstrates that the DX defect evolves under pressure, and that a transition from negative to positive U can occur at about 5--6 GPa." @default.
• W1987192755 created "2016-06-24" @default.
• W1987192755 creator A5058255407 @default.
• W1987192755 creator A5068161681 @default.
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• W1987192755 date "1995-06-15" @default.
• W1987192755 modified "2023-09-27" @default.
• W1987192755 title "Optical investigation of theDXcenters in GaAs under hydrostatic pressure" @default.
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• W1987192755 doi "https://doi.org/10.1103/physrevb.51.17551" @default.
• W1987192755 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9978780" @default.
• W1987192755 hasPublicationYear "1995" @default.
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