Excitons in Carbon Nanotubes with Broken Time-Reversal Symmetry

Details Excitons in Carbon Nanotubes with Broken Time-Reversal Symmetry Excitons in Carbon Nanotubes with Broken Time-Reversal Symmetry

2005-09-16

arxiv.org/abs/cond-mat/0509429v1

Phys. Rev. Lett. 96, 016406 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.016406

Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields ($>$ 55 T). 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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