Raman-scattering study of the phonon dispersion in twisted bi-layer graphene
| Autor: | Campos-Delgado, J., Cançado, L. G., Achete, C. A., Jorio, A., Raskin, J. -P. |
|---|---|
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Nano Research (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s12274-013-0304-z |
| Popis: | Bi-layer graphene with a twist angle \theta\ between the layers generates a superlattice structure known as Moir\'{e} pattern. This superlattice provides a \theta-dependent q wavevector that activates phonons in the interior of the Brillouin zone. Here we show that this superlattice-induced Raman scattering can be used to probe the phonon dispersion in twisted bi-layer graphene (tBLG). The effect reported here is different from the broadly studied double-resonance in graphene-related materials in many aspects, and despite the absence of stacking order in tBLG, layer breathing vibrations (namely ZO' phonons) are observed. Comment: 18 pages, 4 figures, research article |
| Databáze: | arXiv |
| Externí odkaz: |
|