3 research outputs found
The effect of sublattice symmetry breaking on the electronic properties of a doped graphene
Motivated by a number of recent experimental studies, we have carried out the
microscopic calculation of the quasiparticle self-energy and spectral function
in a doped graphene when a symmetry breaking of the sublattices is occurred.
Our systematic study is based on the many-body GW approach that is
established on the random phase approximation and on graphene's massive Dirac
equation continuum model. We report extensive calculations of both the real and
imaginary parts of the quasiparticle self-energy in the presence of a gap
opening. We also present results for spectral function, renormalized Fermi
velocity and band gap renormalization of massive Dirac Fermions over a broad
range of electron densities. We further show that the mass generating in
graphene washes out the plasmaron peak in spectral weight.Comment: 22 Pages, 10 Figure
Ground state properties of a confined simple atom by C fullerene
We numerically study the ground state properties of endohedrally confined
hydrogen (H) or helium (He) atom by a molecule of C. Our study is based
on Diffusion Monte Carlo method. We calculate the effects of centered and small
off-centered H- or He-atom on the ground state properties of the systems and
describe the variation of ground state energies due to the C parameters
and the confined atomic nuclei positions. Finally, we calculate the electron
distributions in plane in a wide range of C parameters.Comment: 23 pages, 9 figures. To appear in J.Phys. B: Atom. Mol. Op
Formation of atomic nanoclusters on graphene sheets
The formation of atomic nanoclusters on suspended graphene sheets have been
investigated by employing a Molecular dynamics simulation at finite
temperature. Our systematic study is based on temperature dependent Molecular
dynamics simulations of some transition and alkali atoms on suspended graphene
sheets. We find that the transition atoms aggregate and make various size
nanoclusters distributed randomly on graphene surface. We also report that most
alkali atoms make one atomic layer on graphene sheets. Interestingly, the
potassium atoms almost deposit regularly on the surface at low temperature. We
expect from this behavior that the electrical conductivity of a suspended
graphene doped by potassium atoms would be much higher than the case doped by
the other atoms at low temperature.Comment: High quality figures can be requested to the author