Magneto-optical spectroscopy of highly aligned carbon nanotubes: Identifying the role of threading magnetic flux

J. Shaver, S. A. Crooker, J. A. Fagan, E. K. Hobbie, N. Ubrig, O. Portugall, V. Perebeinos, Ph Avouris, J. Kono

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Abstract

We have investigated excitons in highly aligned single-walled carbon nanotubes (SWCNTs) through optical spectroscopy at low temperatures down to 1.5 K and high magnetic fields (B) up to 55 T. SWCNT/polyacrylic acid films were stretched, giving SWCNTs that are highly aligned along the direction of stretch (n). Utilizing two well-defined measurement geometries, n B and n B, we provide unambiguous evidence that the photoluminescence energy and intensity are only sensitive to the B -component parallel to the tube axis. A theoretical model of one-dimensional magnetoexcitons, based on exchange-split "bright" and "dark" exciton bands with Aharonov-Bohm-phase-dependent energies, masses, and oscillator strengths, successfully reproduces our observations and allows determination of the splitting between the two bands as ∼4.8 meV for (6,5) SWCNTs.

Original languageEnglish (US)
Article number081402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number8
DOIs
StatePublished - Aug 4 2008

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    Shaver, J., Crooker, S. A., Fagan, J. A., Hobbie, E. K., Ubrig, N., Portugall, O., Perebeinos, V., Avouris, P., & Kono, J. (2008). Magneto-optical spectroscopy of highly aligned carbon nanotubes: Identifying the role of threading magnetic flux. Physical Review B - Condensed Matter and Materials Physics, 78(8), [081402]. https://doi.org/10.1103/PhysRevB.78.081402