Twisted bilayer graphene photoluminescence emission peaks at van Hove singularities.
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Date
2018
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Abstract
We report on photoluminescence emission imaging by femtosecond laser excitation on twisted
bilayer graphene samples. The emission images are obtained by tuning the excitation laser
energies in the near infrared region. We demonstrate an increase of the photoluminescence
emission at excitation energies that depends on the bilayer twist angle. The results show a
peak for the light emission when the excitation is in resonance with transitions at the van Hove
singularities in the electronic density of states. We measured the photoluminescence excitation
peak position and width for samples with various twist angles showing resonances in the
energy range of 1.2 to 1.7 eV.
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Keywords
Luminescence, Femtosecond excitation
Citation
SOUZA, T. V. de A. et al. Twisted bilayer graphene photoluminescence emission peaks at van Hove singularities. Journal of Physics: Condensed Matter, v. 30, n. 17, p. 175302, abr. 2018. Disponível em: <http://iopscience.iop.org/article/10.1088/1361-648X/aab64b>. Acesso em: 16 jun. 2018.