Magneto-optical spectroscopy of excitons in carbon nanotubes

J. Shaver, J. Kono, O. Portugall, V. Krstić, G. L.J.A. Rikken, Y. Miyauchi, S. Maruyama, V. Perebeinos

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We describe recent results of optical experiments on single-walled carbon nanotubes in high magnetic fields, probing the influence of a tube-threading magnetic flux on their band structure and excitonic states. The magnetic flux breaks the time-reversal symmetry and thus lifts the K-K′ valley degeneracy, and the amount of state splitting is determined by the Aharonov-Bohm phase. We show experimental evidence that this field-induced symmetry breaking overcomes the Coulomb-induced exciton splitting which is predicted to make the lowest singlet exciton state optically inactive (or "dark"). Thus, a magnetic field applied parallel to the tube axis "brightens" the dark exciton, resulting in a drastic increase in photoluminescence intensity with magnetic field. We also find that the amount of brightening increases with decreasing temperature.

Original languageEnglish (US)
Pages (from-to)3192-3196
Number of pages5
JournalPhysica Status Solidi (B) Basic Research
Volume243
Issue number13
DOIs
StatePublished - Nov 1 2006

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