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Updated: Jun 25, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Electron-hole interaction in carbon nanotubes: novel screening and exciton excitation spectra
Jack Deslippe1, Mario Dipoppa, David Prendergast
1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Abstract:
The optical response of single-walled carbon nanotubes is dominated by exciton states with unusually large binding energies. We show that screening in semiconducting tubes enhances rather than reduces the electron-hole interaction for separations larger than the tube diameter. This "antiscreening" region deepens the relative energy level of the higher exciton states yielding unconventional excitation spectra. The effect explains the discrepancy in the current experimentally extrapolated exciton binding energies (deduced using conventional model spectra) and those obtained from ab initio calculations on isolated tubes.
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