Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-08-09
Phys. Rev. B 80, 161408(R) (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
published version
Scientific paper
10.1103/PhysRevB.80.161408
We calculate the density-density response function and electron self-energy for undoped bilayer graphene, within the Random Phase Approximation (RPA). We show that the quasiparticle decay rate scales linearly with the quasiparticle energy, and quasiparticle weight vanishes logarithmically in the low-energy limit, indicating non-Fermi liquid behavior. This is a consequence of the absence of a Fermi surface for neutral bilayer graphene and corresponding larger phase space available for scattering processes. Experimental consequences of our results as well as their differences from those of single-layer graphene are discussed.
Barlas Yafis
Yang Kun
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