36 research outputs found
Ab initio calculations of low-energy quasiparticle lifetimes in bilayer graphene
Motivated by recent experimental results we calculate from first-principles
the lifetime of low-energy quasiparticles in bilayer graphene (BLG). We take
into account the scattering rate arising from electron-electron interactions
within the approximation for the electron self-energy and consider several
p-type doping levels ranging from to
holes/cm. In the undoped case we find that the average inverse lifetime
scales linearly with energy away from the charge neutrality point, with values
in good agreement with experiments. The decay rate is approximately three times
larger than in monolayer graphene, a consequence of the enhanced screening in
BLG. In the doped case, the dependence of the inverse lifetime on quasiparticle
energy acquires a non-linear component due to the opening of an additional
decay channel mediated by acoustic plasmons.Comment: 15 pages, 3 figures, accepeted for publication in Applied Physics
Letter