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; R. E. Smalley

doi:10.1103/PhysRevLett.96.016406

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, R. E. Smalley

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108 Scopus citations

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).

Original language	English (US)
Article number	016406
Journal	Physical review letters
Volume	96
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.96.016406
State	Published - Jan 13 2006
Externally published	Yes

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10.1103/PhysRevLett.96.016406

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title = "Excitons in carbon nanotubes with broken time-reversal symmetry",

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).",

author = "S. Zaric and Ostojic, {G. N.} and J. Shaver and J. Kono and O. Portugall and Frings, {P. H.} and Rikken, {G. L.J.A.} and M. Furis and Crooker, {S. A.} and X. Wei and Moore, {V. C.} and Hauge, {R. H.} and Smalley, {R. E.}",

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AU - Zaric, S.

AU - Ostojic, G. N.

AU - Shaver, J.

AU - Kono, J.

AU - Portugall, O.

AU - Frings, P. H.

AU - Rikken, G. L.J.A.

AU - Furis, M.

AU - Crooker, S. A.

AU - Wei, X.

AU - Moore, V. C.

AU - Hauge, R. H.

AU - Smalley, R. E.

PY - 2006/1/13

Y1 - 2006/1/13

N2 - 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).

AB - 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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Excitons in carbon nanotubes with broken time-reversal symmetry

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