Direct observation of dark excitons in individual carbon Nanotubes: Inhomogeneity in the exchange splitting

Ajit Srivastava, Han Htoon, Victor I Klimov, Junichiro Kono

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Abstract

We report the direct observation of spin-singlet dark excitons in individual single-walled carbon nanotubes through low-temperature micro-magneto-photoluminescence spectroscopy. A magnetic field (B) applied along the tube axis brightened the dark state, leading to the emergence of a new emission peak. The peak rapidly grew in intensity with increasing B at the expense of the originally dominated bright exciton peak and became dominant at B>3T. This behavior, universally observed for more than 50 tubes of different chiralities, can be quantitatively modeled by incorporating the Aharonov-Bohm effect and intervalley Coulomb mixing. The directly measured dark-bright splitting values were 1-4 meV for tube diameters 1.0-1.3 nm. Scatter in the splitting value emphasizes the role of the local environment surrounding a nanotube in determining its excitonic fine structure.

Original languageEnglish
Article number087402
JournalPhysical Review Letters
Volume101
Issue number8
DOIs
Publication statusPublished - Aug 21 2008

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inhomogeneity
carbon nanotubes
excitons
tubes
chirality
nanotubes
fine structure
photoluminescence
magnetic fields
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Direct observation of dark excitons in individual carbon Nanotubes : Inhomogeneity in the exchange splitting. / Srivastava, Ajit; Htoon, Han; Klimov, Victor I; Kono, Junichiro.

In: Physical Review Letters, Vol. 101, No. 8, 087402, 21.08.2008.

Research output: Contribution to journalArticle

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