TY - JOUR
T1 - Magneto-optical spectroscopy of highly aligned carbon nanotubes
T2 - Identifying the role of threading magnetic flux
AU - Shaver, J.
AU - Crooker, S. A.
AU - Fagan, J. A.
AU - Hobbie, E. K.
AU - Ubrig, N.
AU - Portugall, O.
AU - Perebeinos, V.
AU - Avouris, Ph
AU - Kono, J.
PY - 2008/8/4
Y1 - 2008/8/4
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.78.081402
DO - 10.1103/PhysRevB.78.081402
M3 - Article
AN - SCOPUS:49249127784
SN - 1098-0121
VL - 78
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 8
M1 - 081402
ER -