Article,

Resonance Raman scattering on one-dimensional systems

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INDIAN JOURNAL OF PHYSICS AND PROCEEDINGS OF THE INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE-PART B, 77B (1): 75-99 (2003)

Abstract

A review of the resonance Raman effect in one-dimensional (1D) system is presented. Due to the strong electron-phonon coupling and the quantum confinement of electrons and phonons in 1D systems. interesting effects are observed, Such as asymmetries in the Stokes/anti-Stokes spectra and line-shape dependence on satisfying the resonance condition. Analysis of these effects give detailed information about the confined phonon and electron states. showing that resonance inicro-Raman spectroscopy of phonon modes can determine electronic and structural properties of 1D-systems. The single wall carbon nanotube (SWNT) is used as a prototype 1D system for describing resonance Raman scattering in 1D, since many experimental results are now available for this system at the single nanotube level, and because detailed theoretical modeling can be carried out for this system. The results on SWNTs, should provide a valuable guide for Raman studies on other 1D systems. It is also shown that the resonance Raman effect provides a useful technique for obtaining phonon dispersion relations for nanoscale samples, and that measurements on low dimensional systems can be used to obtain important information about related higher dimensional systems that is otherwise difficult to obtain.

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