Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 12: POSTER Colloids, Nanoparticles and Self-Organizing Systems
CPP 12.12: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Is the radial breathing mode really radial? — •M. Mohr, M. Machón, and C. Thomsen — Institut für Festkörperphysik, TU Berlin, Hardenbergstr. 36, 10623 Berlin
The diameter-dependent radial breathing mode (RBM) plays a key role in the characterization of single-walled nanotubes. This mode is often assumed to be purely radial. Ab initio calculations of the phonons have shown the existence of a non-radial component which is small but has important effects, e.g. in the electron-phonon coupling.1 A simple geometrical model based on symmetry considerations shows similar results.2 We demonstrate with an independent variational approach that the RBM is not radial and study the dependence of the non-radial component on diameter and chirality.
[1] M. Machón et al. Phys. Rev. B 16 035416 (2005)
[2] M. Damnjanović et al., J. Phys.: Condens. Matter 16 (2004) L505