Excitons in Carbon Nanotubes with Broken Time-Reversal Symmetry

S. Zaric, G. N. Ostojic, J. Shaver, J. Kono, O. Portugall, P. H. Frings, G. L. J. A. Rikken, M. Furis, S. A. Crooker, X. Wei, V. C. Moore, R. H. Hauge, and R. E. Smalley
Phys. Rev. Lett. 96, 016406 – Published 11 January 2006

Abstract

Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields (>55T). We show that the peak separation is determined by the Aharonov-Bohm phase due to the tube-threading magnetic flux, which breaks the time-reversal symmetry and lifts the valley degeneracy. This field-induced symmetry breaking thus overcomes the Coulomb-induced intervalley mixing which is predicted to make the lowest exciton state optically inactive (or dark).

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  • Received 15 September 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.016406

©2006 American Physical Society

Authors & Affiliations

S. Zaric1, G. N. Ostojic1, J. Shaver1, J. Kono1,*, O. Portugall2, P. H. Frings2, G. L. J. A. Rikken2, M. Furis3, S. A. Crooker3, X. Wei4, V. C. Moore5, R. H. Hauge5, and R. E. Smalley5

  • 1Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
  • 2Laboratoire National des Champs Magnétiques Pulsés, 31432 Toulouse Cedex 04, France
  • 3National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 4National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
  • 5Department of Chemistry, Rice University, Houston, Texas 77005, USA

  • *To whom all correspondence should be addressed. Electronic address: kono@rice.edu.

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Vol. 96, Iss. 1 — 13 January 2006

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