Prolonged spontaneous emission and dephasing of localized excitons in air-bridged carbon nanotubes
| Autor: | James Hone, Chee Wei Wong, Zhengyi Zhang, William Walden-Newman, Stefan Strauf, Ibrahim Sarpkaya, Xuesi Wang |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Photoluminescence Dephasing Exciton General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Carbon nanotube 01 natural sciences 7. Clean energy Molecular physics General Biochemistry Genetics and Molecular Biology law.invention Condensed Matter::Materials Science law 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Spontaneous emission 010306 general physics Biexciton Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics business.industry General Chemistry 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Optical properties of carbon nanotubes Optoelectronics 0210 nano-technology business Order of magnitude |
| Zdroj: | Nature communications. 4 |
| ISSN: | 2041-1723 |
| Popis: | The bright exciton emission of semiconducting carbon nanotubes is appealing for optoelectronic and quantum photonic devices as well as fundamental studies of light-matter interaction in one-dimensional nanostructures. The photophysics of excitons in carbon nanotubes till date is however largely affected by extrinsic effects of the dielectric environment. Here we carried out time-resolved photoluminescence measurements over 14 orders of magnitude for ultra-clean carbon nanotubes bridging an airgap over pillar posts. Our measurements demonstrate a new regime of intrinsic exciton photophysics with prolonged spontaneous emission times up to T1=18 ns, between one to two orders of magnitude better than prior measurements and in agreement with values first hypothesized by theorists about a decade ago. Further we establish for the first time the exciton decoherence times of individual nanotubes in the time-domain and found four-fold prolonged values up to T2=2.1 ps compared to ensemble measurements. These first observations motivate new discussions about the magnitude of the intrinsic dephasing mechanism while the prolonged exciton dynamics is promising for device applications. |
| Databáze: | OpenAIRE |
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