Thermally stable carbon-related centers in 6H-SiC: photoluminescence spectra and microscopic models

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dc.creatorMattausch, Alexander
dc.creatorBockstedte, Michel
dc.creatorPankratov, Oleg
dc.creatorSteeds, John W.
dc.creatorFurkert, Suzanne
dc.creatorHayes, Jonathan M.
dc.creatorSullivan, Wayne
dc.creatorWright, Nick G.
dc.date2006-03-23
dc.date.accessioned2026-07-07T07:56:23Z
dc.date.available2026-07-07T07:56:23Z
dc.descriptionRecent 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.
dc.description4 pages, 3 figures, to appear in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0603615
dc.identifierhttp://arxiv.org/abs/cond-mat/0603615
dc.identifierPhys. Rev. B 73, 161201(R) (2006)
dc.identifierdoi:10.1103/PhysRevB.73.161201
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/127288
dc.subjectMaterials Science
dc.titleThermally stable carbon-related centers in 6H-SiC: photoluminescence spectra and microscopic models
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