18 November 2014 Intrinsic regime of exciton photophysics in ultra-clean carbon nanotubes bridging an air gap (presentation video)
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Abstract
We demonstrate a new regime of intrinsic exciton photophysics in SWCNTs with narrow spectral linewidth down to 200 μeV and prolonged spontaneous emission times up to T1=18 ns, about two orders of magnitude better than prior measurements and in agreement with values(10-100ns) 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.
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Ibrahim Sarpkaya, Zhengyi Zhang, William Walden-Newman, James Hone, Chee Wei Wong, Stefan Strauf, "Intrinsic regime of exciton photophysics in ultra-clean carbon nanotubes bridging an air gap (presentation video)", Proc. SPIE 9168, Carbon Nanotubes, Graphene, and Associated Devices VII, 91680L (18 November 2014); doi: 10.1117/12.2063300; https://doi.org/10.1117/12.2063300
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