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Title: | Zero m phonons in metal chalcogenide nanotubes | Authors: | Milošević, Ivanka Dobardžić, Edib Dakić, B. Damnjanović, M. |
Issue Date: | 1-Dec-2007 | Journal: | Journal of Physics: Conference Series | Abstract: | Phonon dispersions of single-wall MoS2 and WS2 nanotubes are calculated within a full symmetry implemented valence force-field model. Tubular structure is found to be characterized by two Raman active modes: by the in-phase breathing modes (in full analogy to carbon nanotubes) with frequency approaching Brillouin scattering domain (as diameter approaches nm), and by the high-energy breathing mode with sulfur shells breathing in phase, but out of phase relative to the Mo/W atoms. Likewise, the longitudinal rigid-shell mode, where sulfur shells vibrate out of phase whilst Mo/W atoms barely move, is predicted to be a fingerprint of the cylindrical configuration in infrared spectra. It is also found that twisting rigid-layer modes characterize chirality of the tubes. Finally, the large diameter limit is discussed and related to the measured Raman and infrared spectra of the layered structures. © 2007 IOP Publishing Ltd. |
URI: | https://physrep.ff.bg.ac.rs/handle/123456789/53 | ISSN: | 1742-6588 | DOI: | 10.1088/1742-6596/92/1/012141 |
Appears in Collections: | Journal Article |
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