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Lookup NU author(s): Professor Nick Wright
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Recent ab initio calculations [Mattausch, Phys. Rev. B 70, 235211 (2004)] of carbon clusters in SiC reveal a possible connection between the tricarbon antisite (C3) Si and the U photoluminescence center in 6H-SiC [Evans, Phys. Rev. B 66, 35204 (2002)]. Yet, some of the predicted vibrational modes were not observed experimentally. We report experiments that, indeed, confirm the existence of a low-energy mode for the U center (as well as for the HT3 and HT4 centers with spectral details similar to the U center). We calculated the isotope splitting for the (C3) Si -defect and found near-perfect agreement with our data. In addition, we discuss the carbon di-interstitial (C2) Hex as a model for the Z and HT5 centers. The isotope splitting is also well reproduced, but the absolute values of the local mode energies show a discrepancy of about 10 meV. © 2006 The American Physical Society.
Author(s): Mattausch A, Bockstedte M, Pankratov O, Steeds JW, Furkert S, Hayes JM, Sullivan W, Wright NG
Publication type: Article
Publication status: Published
Journal: Physical Review B
ISSN (print): 1098-0121
ISSN (electronic): 1550-235X
Publisher: American Physical Society
Notes: Article no. 161201
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