Observation of Electronic Raman Scattering in Metallic Carbon Nanotubes

TL;DR

This paper reports the first experimental observation of electronic Raman scattering in individual metallic carbon nanotubes, revealing their unique electronic structure through resonant Raman peaks.

Contribution

It provides the first experimental evidence of electronic Raman scattering in metallic carbon nanotubes, highlighting their one-dimensional electronic properties.

Findings

Resonant electronic Raman peaks observed in metallic nanotubes

Electronic Raman scattering linked to low-energy electron-hole pairs

Distinct spectral features due to the nanotubes' electronic structure

Abstract

We present experimental measurements of the electronic contribution to the Raman spectra of individual metallic single-walled carbon nanotubes (MSWNTs). Photoexcited carriers are inelastically scattered by a continuum of low-energy electron-hole pairs created across the graphenelike linear electronic subbands of the MSWNTs. The optical resonances in MSWNTs give rise to well-defined electronic Raman peaks. This resonant electronic Raman scattering is a unique feature of the electronic structure of these one-dimensional quasimetals.