Optical-phonon resonances with saddle-point excitons in twisted-bilayer graphene

Jorio, Ado and Kasperczyk, Mark and Clark, Nick and Neu, Elke and Maletinsky, Patrick and Vijayaraghavan, Aravind and Novotny, Lukas. (2014) Optical-phonon resonances with saddle-point excitons in twisted-bilayer graphene. Nano Letters, Vol. 14, H. 10. pp. 5687-5692.

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Official URL: http://edoc.unibas.ch/dok/A6337990

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Twisted-bilayer graphene (tBLG) exhibits van Hove singularities in the density of states that can be tuned by changing the twisting angle θ. A θ-defined tBLG has been produced and characterized with optical reflectivity and resonance Raman scattering. The θ-engineered optical response is shown to be consistent with persistent saddle-point excitons. Separate resonances with Stokes and anti-Stokes Raman scattering components can be achieved due to the sharpness of the two-dimensional saddle-point excitons, similar to what has been previously observed for one-dimensional carbon nanotubes. The excitation power dependence for the Stokes and anti-Stokes emissions indicate that the two processes are correlated and that they share the same phonon.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Georg H. Endress-Stiftungsprofessur für Experimentalphysik (Maletinsky)
UniBasel Contributors:Maletinsky, Patrick M.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Oct 2017 07:35
Deposited On:06 Feb 2015 09:59

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