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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Excitons in carbon nanotubes with broken time-reversal symmetry
S Zaric1, G N Ostojic, J Shaver
1Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA.
Abstract:
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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