Physics – Condensed Matter – Materials Science
Scientific paper
2010-06-15
Phys. Rev. B 82, 195428 (2010)
Physics
Condensed Matter
Materials Science
Typos corrected in equations, expanded discussion, new section on crossover from bilayer to single layer behaviour, new figure
Scientific paper
10.1103/PhysRevB.82.195428
We theoretically study the dynamic screening properties of bilayer graphene within the random phase approximation assuming quadratic band dispersion and zero gap for the single-particle spectrum. We calculate the frequency dependent dielectric function of the system and obtain the low energy plasmon dispersion and broadening of the plasmon modes from the dielectric function. We also calculate the optical spectral weight (i.e. the dynamical structure factor) for the system. We find that the leading order long wavelength limit of the plasmon dispersion matches with the classical result for 2D electron gas. However, contrary to electron gas systems, the non-local plasmon dispersion corrections decrease the plasmon frequency. The non-local corrections are also different from the single layer graphene. Finally, we also compare our results with the double layer graphene system (i.e. a system of two independent graphene monolayers).
Hwang Euyheon H.
Sarma Sankar Das
Sensarma Rajdeep
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