The effects of quantum interferences on the excitation dependence of the intensity of $G$ modes have been investigated on single-walled carbon nanotubes [Duque et al., Phys. Rev. Lett. 108, 117404 (2012)]. In this work, by combining optical absorption spectroscopy and Raman scattering on individual index identified double-walled carbon nanotubes, we examine the experimental excitation dependence of the intensity of longitudinal optical and transverse optical $G$ modes of the constituent inner and outer single-walled carbon nanotubes. The observed striking dependencies are understood in terms of quantum interference effects. Considering such effects, the excitation dependence of the different components of the $G$ modes permits us to unambiguously assign each of them as originating from the longitudinal or transverse $G$ modes of inner and outer tubes.

• Received 8 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.205411