Direct Observation of Dark Excitons in Individual Carbon Nanotubes: Role of Local Environments

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dc.creatorSrivastava, A.
dc.creatorHtoon, H.
dc.creatorKlimov, V. I.
dc.creatorKono, J.
dc.date2008-04-05
dc.date.accessioned2026-07-07T09:57:25Z
dc.date.available2026-07-07T09:57:25Z
dc.descriptionWe report the direct observation of the spin-singlet dark excitonic state in individual single-walled carbon nanotubes through low-temperature micro-photoluminescence spectroscopy in magnetic fields. A magnetic field up to 5 T, applied along the nanotube axis, brightened the dark state, leading to the emergence of a new emission peak. The peak rapidly grew in intensity with increasing field at the expense of the originally-dominant bright exciton peak and finally became dominant at fields $>$3 T. This behavior, universally observed for more than 50 nanotubes of different chiralities, can be quantitatively explained through a model incorporating the Aharonov-Bohm effect and intervalley Coulomb mixing, unambiguously proving the existence of dark excitons. The directly measured dark-bright splitting values were 1-4 meV for tube diameters 1.0-1.3 nm. Scatter in the splitting value emphasizes the role of the local environment surrounding a nanotube in determining the excitonic fine structure of single-walled carbon nanotubes.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0804.0875
dc.identifierhttp://arxiv.org/abs/0804.0875
dc.identifierPhysical Review Letters 101, 087402 (2008)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/167335
dc.subjectMesoscale and Nanoscale Physics
dc.subjectMaterials Science
dc.titleDirect Observation of Dark Excitons in Individual Carbon Nanotubes: Role of Local Environments
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