Journal
PHYSICAL REVIEW B
Volume 80, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.161408
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Funding
- NSF [DMR-0704133]
- State of Florida
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0704133] Funding Source: National Science Foundation
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We calculate the density-density response function and electron self-energy for undoped bilayer graphene within the random phase approximation. 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.
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