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 ($>$ 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'').

4 pages, 4 figures

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Cited by in corpus (15)

• Magnetic Brightening of Carbon Nanotube Photoluminescence through Symmetry Breaking
• Strong exciton-plasmon coupling in semiconducting carbon nanotubes
• Hofstadter butterflies of carbon nanotubes: Pseudofractality of the magnetoelectronic spectrum
• Chirality Dependence of the $K$-Momentum Dark Excitons in Carbon Nanotubes
• Inter-valley scattering induced by Coulomb interaction and disorder in carbon-nanotube quantum dots
• Magneto-spectroscopy of Highly-Aligned Carbon Nanotubes: Identifying the Role of Threading Magnetic Flux
• Aharonov-Bohm Exciton Absorption Splitting in Chiral Specific Single-Walled Carbon Nanotubes in Magnetic Fields of up to 78 T
• Anomalous magnetization of a carbon nanotube as an excitonic insulator
• Band-edge Exciton States in a Single-walled Carbon Nanotube Revealed by Magneto-optical Spectroscopy in Ultra-high Magnetic Field
• Magneto-reflection spectroscopy of monolayer transition-metal dichalcogenide semiconductors in pulsed magnetic fields
• Survey of Exciton-Phonon Sidebands by Magneto-optical Spectroscopy Using Highly Purified (6,5) Single-walled Carbon Nanotubes
• Exciton-phonon Bound Complex in Single-walled Carbon Nanotubes Revealed by High-field Magneto-optical Spectroscopy
• The Future of the Correlated Electron Problem
• Universality in the Photophysics of pi-Conjugated Polymers and Single-Walled Carbon Nanotubes
• Quantization of exciton in magnetic field background