تقرير
Optical-phonon resonances with saddle-point excitons in twisted-bilayer graphene
| العنوان: | Optical-phonon resonances with saddle-point excitons in twisted-bilayer graphene |
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| المؤلفون: | Jorio, Ado, Kasperczyk, Mark, Clark, Nick, Neu, Elke, Maletinsky, Patrick, Vijayaraghavan, Aravind, Novotny, Lukas |
| سنة النشر: | 2014 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics |
| الوصف: | Twisted-bilayer graphene (tBLG) exhibits van Hove singularities in the density of states that can be tuned by changing the twisting angle $\theta$. A $\theta$-defined tBLG has been produced and characterized with optical reflectivity and resonance Raman scattering. The $\theta$-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. Comment: 5 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1021/nl502412g |
| الوصول الحر: | http://arxiv.org/abs/1406.7344Test |
| رقم الانضمام: | edsarx.1406.7344 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1021/nl502412g |
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