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Observation of Charged Excitons in Hole-Doped Carbon Nanotubes Using Photoluminescence and Absorption Spectroscopy

Ryusuke Matsunaga, Kazunari Matsuda, and Yoshihiko Kanemitsu
Phys. Rev. Lett. 106, 037404 – Published 18 January 2011
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Abstract

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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  • Received 13 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.037404

© 2011 The American Physical Society

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A new quasiparticle in carbon nanotubes

Published 18 January 2011

Trions—one electron bound to two holes via Coulomb forces—can be observed in the optical spectra of doped carbon nanotubes.

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Authors & Affiliations

Ryusuke Matsunaga1, Kazunari Matsuda1, and Yoshihiko Kanemitsu1,2

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
  • 2Photonics and Electronics Science and Engineering Center, Kyoto University, Kyoto 615-8510, Japan

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Issue

Vol. 106, Iss. 3 — 21 January 2011

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