期刊
NATURE COMMUNICATIONS
卷 4, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms3152
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资金
- National Science Foundation (NSF) [ECCS-1053537]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- NSF [DMR-1006533, DMR-1108176, DMR-0922522]
- NSF (IGERT) [DGE-1069240]
- NSF (CAREER award) [ECCS-0747787]
- US Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006533] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1053537] Funding Source: National Science Foundation
The bright exciton emission of carbon nanotubes is appealing for optoelectronic devices and fundamental studies of light-matter interaction in one-dimensional nanostructures. However, to date, the photophysics of excitons in carbon nanotubes is largely affected by extrinsic effects. Here we perform time-resolved photoluminescence measurements over 14 orders of magnitude for ultra-clean carbon nanotubes bridging an air gap over pillar posts. Our measurements demonstrate a new regime of intrinsic exciton photophysics with prolonged spontaneous emission times up to T-1 = 18 ns, about two orders of magnitude better than prior measurements and in agreement with values hypothesized by theorists about a decade ago. Furthermore, we establish for the first time exciton decoherence times of individual nanotubes in the time domain and find fourfold prolonged values up to T-2 = 2.1 ps compared with ensemble measurements. These first observations motivate new discussions about the magnitude of the intrinsic dephasing mechanism while the prolonged exciton dynamics is promising for applications.
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