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EnglishWe study the dependence of the plasmon dispersion relation of graphene on applied uniaxial strain. Besides electron correlation at the random-phase approximation level, we also include local field effects specific for the honeycomb lattice. As a consequence of the two-band character of the electronic band structure, we find two distinct plasmon branches. We recover the square-root behavior of the low-energy branch, and find a nonmonotonic dependence of the strain-induced modification of its stiffness, as a function of the wave-vector orientation with respect to applied strain. We also take into account the full three-dimensional representation for the wave functions of single-particle excitations. This induces quantitative changes in the plasmon dispersion relation.
| Titolo: | Strain effect on the electronic spectrum of graphene: beyond two-dimensionality |
| Autori interni: | |
| Data di pubblicazione: | 2016 |
| Handle: | http://hdl.handle.net/20.500.11769/59953 |
| ISBN: | 9781466591318 |
| Appare nelle tipologie: | 2.1 Contributo in volume (Capitolo o Saggio) |
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