title: Magnetic brightening of carbon nanotube photoluminescence through symmetry breaking.
abstract: We report that symmetry breaking by a magnetic field can drastically increase the photoluminescence quantum yield of single-walled carbon nanotubes, by as much as a factor of 6, at low temperatures. To explain this we have developed a theoretical model based on field-dependent exciton band structure and the interplay of Coulomb interactions and the Aharonov-Bohm effect. This conclusively explains our data as the first experimental observation of dark excitons 5-10 meV below the bright excitons.
authors.affiliation: Department of Electrical & Computer Engineering and Carbon Nanotechnology Laboratory, Rice University, Houston, Texas 77005, USA.
authors.forename: Jonah
authors.initials: J
authors.lastname: Shaver
authors.forename: Junichiro
authors.initials: J
authors.lastname: Kono
authors.forename: Oliver
authors.initials: O
authors.lastname: Portugall
authors.forename: Vojislav
authors.initials: V
authors.lastname: Krstić
authors.forename: Geert L J A
authors.initials: GL
authors.lastname: Rikken
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Miyauchi
authors.forename: Shigeo
authors.initials: S
authors.lastname: Maruyama
authors.forename: Vasili
authors.initials: V
authors.lastname: Perebeinos
mesh_terms: D049449:Luminescence; D008280:Magnetics; D037742:Nanotubes, Carbon / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon