title: Unifying the low-temperature photoluminescence spectra of carbon nanotubes: the role of acoustic phonon confinement.
abstract: At low temperature the photoluminescence of single-wall carbon nanotubes show a large variety of spectral profiles ranging from ultranarrow lines in suspended nanotubes to broad and asymmetrical line shapes that puzzle the current interpretation in terms of exciton-phonon coupling. Here, we present a complete set of photoluminescence profiles in matrix embedded nanotubes including unprecedented narrow emission lines. We demonstrate that the diversity of the low-temperature luminescence profiles in nanotubes originates in tiny modifications of their low-energy acoustic phonon modes. When low-energy modes are locally suppressed, a sharp photoluminescence line as narrow as 0.7 meV is restored. Furthermore, multipeak luminescence profiles with specific temperature dependence show the presence of confined phonon modes.
authors.affiliation: Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France.
authors.forename: F
authors.initials: F
authors.lastname: Vialla
authors.affiliation: Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Chassagneux
authors.affiliation: Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France.
authors.forename: R
authors.initials: R
authors.lastname: Ferreira
authors.affiliation: Laboratoire Aimé Cotton, École Normale Supérieure de Cachan, Université Paris Sud, CNRS (UPR3321), F-91405 Orsay, France.
authors.forename: C
authors.initials: C
authors.lastname: Roquelet
authors.affiliation: Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Diederichs
authors.affiliation: Laboratoire Charles Coulomb, Université de Montpellier, CNRS (UMR5221), F-34095 Montpellier, France.
authors.forename: G
authors.initials: G
authors.lastname: Cassabois
authors.affiliation: Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France.
authors.forename: Ph
authors.initials: P
authors.lastname: Roussignol
authors.affiliation: Laboratoire Aimé Cotton, École Normale Supérieure de Cachan, Université Paris Sud, CNRS (UPR3321), F-91405 Orsay, France.
authors.forename: J S
authors.initials: JS
authors.lastname: Lauret
authors.affiliation: Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Voisin