The Optical Resonances in Carbon Nanotubes Arise from Excitons

By Feng Wang, G. Dukovic, L. Brus, T. Heinz. Science, 2005

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Polaritons in layered two-dimensional materials. (2016, background): “ergies observed in carbon nanotubes[90] and conjugated polymer chains [91].”
Electronic and transport properties of nanotubes (2007, background): “Maultzsch et al., 2005; Wang et al., 2005a".”
Materials perspective on Casimir and van der Waals interactions (2015, background): “The CNT optical activity, such as electron-energy-loss spectroscopy (EELS) spectra and circular dichroism, are chirality dependent (Dresselhaus et al., 2007; Wang et al., 2005).”
Hexagonal boron nitride is an indirect bandgap semiconductor (2015, background): “Two-photon spectroscopy is a powerful technique for accessing information on the bound states of the exciton relative motion [22], which has recently regained attention in carbon nanotubes [38, 39] or transition metal dichalcogenide monolayers [40, 41].”
Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes (2006, methodology): “4a, we show the change in tube radius dr with atom coordinate along tube Z axis calculated for the (7,6) tube shown in the inset.”