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.
Original language | English (US) |
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Pages (from-to) | 1851-1855 |
Number of pages | 5 |
Journal | Nano letters |
Volume | 7 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2007 |