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Substitutional carb...
Substitutional carbon in germanium
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- Hoffmann, L. (author)
- Institute of Physics and Astronomy, Aarhus University, Aarhus, Denmark
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- Bach, J. C. (author)
- Institute of Physics and Astronomy, Aarhus University, Aarhus, Denmark
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- Bech Nielsen, B. (author)
- Institute of Physics and Astronomy, Aarhus University, Aarhus, Denmark
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- Leary, P. (author)
- Department of Physics, University of Exeter, Exeter, United Kingdom
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- Jones, R. (author)
- Department of Physics, University of Exeter, Exeter, United Kingdom
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- Öberg, Sven (author)
- Luleå tekniska universitet,Matematiska vetenskaper
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(creator_code:org_t)
- 1997
- 1997
- English.
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In: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 55:17, s. 11167-11173
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Carbon impurities implanted into single-crystalline germanium are studied with infrared absorption spectroscopy and ion channeling. After implantation of 12C+ at room temperature and subsequent annealing at 350 °C, a sharp infrared absorption line is observed at 531 cm-1. When 12C+ is substituted by 13C+, the line shifts down in frequency to 512 cm-1 and co-implantation of 12C+ and 13C+ does not give rise to additional lines. Therefore, the 531-cm-1 line represents a local vibrational mode of a defect containing a single carbon atom. Channeling measurements are carried out around the 〈100〉, 〈110〉, and 〈111〉 axes in 12C+-implanted samples annealed at 450 °C. The analysis of the data shows that 31±3 % of the carbon atoms are located at substitutional sites, while the remaining carbon atoms appear to be located randomly. The population of the substitutional site and the intensity of the 531-cm-1 mode have identical temperature dependencies. It is concluded that the 531-cm-1 mode is the three-dimensional T2 stretch mode of substitutional carbon. The effective charge of the mode is determined to be (3.4±0.5)e.mAb initio local density functional cluster theory is applied to calculate the structure and the local vibrational modes of substitutional carbon in germanium. The calculated frequencies and isotope shifts for the T2 stretch mode are in good agreement with the observations.
Subject headings
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
Keyword
- Scientific Computing
- Teknisk-vetenskapliga beräkningar
Publication and Content Type
- ref (subject category)
- art (subject category)
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