Selection rules for Raman-active electronic excitations in carbon nanotubes

TL;DR

This paper develops a theoretical framework for understanding non-resonant inelastic light scattering in carbon nanotubes, focusing on electronic excitations and their selection rules, which enhances the interpretation of Raman spectra beyond vibrational modes.

Contribution

It introduces a theory predicting selection rules and polarization properties for intersubband Raman active modes in carbon nanotubes, expanding the understanding of electronic excitations in these materials.

Findings

Predicted selection rules for intersubband Raman modes

Identified polarization dependencies of Raman-active electronic excitations

Provided a theoretical basis for interpreting non-vibrational Raman signals

Abstract

Raman measurements in carbon allotropes are generally associated with the exploration of the vibrational modes. Here, we present a theory of the non-resonant inelastic light scattering accompanied by the excitations of intersubband electron-hole pairs in carbon nanotubes and predict the selection rules and polarization properties of the dominant intersubband Raman active modes.