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HL: Fachverband Halbleiterphysik

HL 11: C/diamond

HL 11.7: Vortrag

Montag, 25. Februar 2008, 12:30–12:45, EW 202

Phonon symmetries of carbon picotubes — •Nils Rosenkranz¹, María Machón¹, Rainer Herges², and Christian Thomsen¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — ²Institut für Organische Chemie, Christian-Albrechts-Universität Kiel, Otto-Hahn-Platz 4, 24098 Kiel, Germany

Picotubes are ring-shaped hydrocarbons closely related to very short carbon nanotubes. They seem to be a promising starting point for the specific synthesis of nanotubes, which is one of the great goals in nanotube research. We identified the symmetries of all main modes in the Raman spectrum of semitrimer picotubes by performing polarization-dependent Raman measurements on crystalline samples. Furthermore, the semitrimer molecule has been subject to ab initio calculations, the results of which agree excellently to the experimental data. By comparing experiment and theory, we can assign phonon eigenvectors to all main Raman peaks.