title: Direct experimental evidence of exciton-phonon bound states in carbon nanotubes.
abstract: We present direct experimental observation of exciton-phonon bound states in the photoluminescence excitation spectra of isolated single-walled carbon nanotubes (SWNT) in aqueous suspension. The photoluminescence excitation spectra from several distinct SWNTs show the presence of at least one sideband related to the tangential modes, lying 0.2 eV above the main absorption or emission peak. Both the energy position and line shapes of the sidebands are in excellent agreement with recent calculations [Phys. Rev. Lett. 94, 027402 (2005)] that predict the existence of exciton-phonon bound states, a sizable spectral weight transfer to these exciton-phonon complexes, and that the amount of this transfer depends on the specific nanotube structure and diameter.
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais, C.P. 702, Belo Horizonte, MG, 30123-970 Brazil. plentz@fisica.ufmg.br
authors.forename: Flávio
authors.initials: F
authors.lastname: Plentz
authors.forename: Henrique B
authors.initials: HB
authors.lastname: Ribeiro
authors.forename: Ado
authors.initials: A
authors.lastname: Jorio
authors.forename: Michael S
authors.initials: MS
authors.lastname: Strano
authors.forename: Marcos A
authors.initials: MA
authors.lastname: Pimenta