Journal
PHYSICAL REVIEW B
Volume 80, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.115436
Keywords
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Funding
- JSPS [21-1890, 20-3712, 20340075]
- MEXT of Japan [20048004, 20104006]
- Grants-in-Aid for Scientific Research [20340075, 20048004, 20104006] Funding Source: KAKEN
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We investigated the magnetic and temperature dependence of the bright and dark exciton luminescence spectra in single carbon nanotubes. We found that the phonon-induced exciton scattering rate from the bright to the dark state is only one order of magnitude larger than the dark exciton recombination rate below 10 K at zero magnetic field. Our results indicate that excitons are nonequilibriumly distributed between the bright and dark states due to the different parities of the wave functions and that Aharonov-Bohm flux enhances the phonon-induced exciton scattering between these two states. Our nonequilibrium exciton distribution model can also explain the nonzero photoluminescence intensity at very low temperatures.
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