Excitons in carbon nanotubes with broken time-reversal symmetry.
Phys Rev Lett
; 96(1): 016406, 2006 Jan 13.
Article
in En
| MEDLINE
| ID: mdl-16486491
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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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2006
Document type:
Article
Affiliation country:
Estados Unidos