@article {0953-8984-30-17-175302,
	title = {Twisted bilayer graphene photoluminescence emission peaks at van Hove singularities},
	journal = {Journal of Physics: Condensed Matter},
	volume = {30},
	number = {17},
	year = {2018},
	pages = {175302},
	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.},
	url = {http://stacks.iop.org/0953-8984/30/i=17/a=175302},
	author = {Thonimar V Alencar and Driele von Dreifus and Maria Gabriela Cota Moreira and Gomes S N Eliel and Chao-Hui Yeh and Po-Wen Chiu and Marcos A Pimenta and Leandro M Malard and Ana Maria de Paula}
}
