Department of Physics Papers

Document Type

Journal Article

Date of this Version

10-6-2008

Comments

Suggested Citation:
O.N. Torrens, M. Zheng, and J.M. Kikkawa. (2008). "Energy of K-Momentum Dark Excitons in Carbon Nanotubes by Optical Spectroscopy." Physical Review Letters. 101, 157401.

© 2008 The American Physical Society
http://dx.doi.org/10.1103/PhysRevLett.101.157401

Abstract

Phonon sideband optical spectroscopy determines the energy of the dark K-momentum exciton for (6,5) carbon nanotubes. One-phonon sidebands appear in absorption and emission, split by two zone-boundary (K-point) phonons. Their average energy locates the E11 K-momentum exciton 36 meV above the E11 bright level, higher than available theoretical estimates. A model for exciton-phonon coupling shows the absorbance sideband depends sensitively on the K-momentum exciton effective mass and has minimal contributions from zone-center phonons, which dominate the Raman spectra of carbon nanotubes.

 

Date Posted: 13 January 2011

This document has been peer reviewed.