Observation of charged excitons in hole-doped carbon nanotubes using photoluminescence and absorption spectroscopy

Details Observation of charged excitons in hole-doped carbon nanotubes using photoluminescence and absorption spectroscopy Observation of charged excitons in hole-doped carbon nanotubes using photoluminescence and absorption spectroscopy

2010-09-13

arxiv.org/abs/1009.2297v2

Phys. Rev. Lett. 106, 037404 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We report the first observation of trions (charged excitons), three-particle bound states consisting of one electron and two holes, in hole-doped carbon nanotubes at room temperature. When p-type dopants are added to carbon nanotube solutions, the photoluminescence and absorption peaks of the trions appear far below the E11 bright exciton peak, regardless of the dopant species. The unexpectedly large energy separation between the bright excitons and the trions is attributed to the strong electron-hole exchange interaction in carbon nanotubes.

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