First evidence for vibrational excitations of large atomic clusters in amorphous semiconductors |
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| Authors: | RJ Nemanich SA Solin G Lucovsky |
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| Institution: | Department of Physics and The James Franck Institute, The University of Chicago, Chicago, IL 60637, U.S.A.;Xerox Palo Alto Research Center, Palo Alto, CA 94304, U.S.A. |
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| Abstract: | Raman and depolarization spectra of GeSe2 alloyed with Se or As2Se reveal a sharp vibrational doublet, only one component of which can be attributed to a vibrational excitation of the GeSe2 local atomic cluster. The composition dependence of the intensity and polarization of the second feature identify it as an excitation involving a substantially larger cluster with high symmetry. The large cluster is a ring of Ge atoms inter-connected through single Se atoms |
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