Physics – Condensed Matter – Materials Science
Scientific paper
2006-03-23
Phys. Rev. B 73, 161201(R) (2006)
Physics
Condensed Matter
Materials Science
4 pages, 3 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.161201
Recent ab initio calculations [Mattausch et al., Phys. Rev. B 70, 235211 (2004)] of carbon clusters in SiC reveal a possible connection between the tricarbon antisite (C_3)_Si and the U photoluminescence center in 6H-SiC [Evans et al., Phys. Rev. B 66, 35204 (2002)]. Yet, some of the predicted vibrational modes were not observed experimentally. Here we report experiments which 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 (C_3)_Si-defect and found near-perfect agreement with our data. In addition, we discuss the carbon di-interstitial (C_2)_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.
Bockstedte Michel
Furkert Suzanne
Hayes Jonathan M.
Mattausch Alexander
Pankratov Oleg
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