Prolonged spontaneous emission and dephasing of localized excitons in air-bridged carbon nanotubes

Ibrahim Sarpkaya, Zhengyi Zhang, William Walden-Newman, Xuesi Wang, James Hone, Chee W. Wong and Stefan Strauf ()
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Ibrahim Sarpkaya: Stevens Institute of Technology
Zhengyi Zhang: Columbia University
William Walden-Newman: Stevens Institute of Technology
Xuesi Wang: Columbia University
James Hone: Columbia University
Chee W. Wong: Columbia University
Stefan Strauf: Stevens Institute of Technology

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract 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 T1=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 T2=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.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3152

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DOI: 10.1038/ncomms3152

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