1202.2132 (Hongki Min et al.)

Polarizability and Screening in Chiral Multilayer Graphene    [PDF]

Hongki Min, E. H. Hwang, S. Das Sarma

We calculate the static polarizability of multilayer graphene and study the
effect of stacking arrangement, carrier density, and onsite energy difference
on graphene screening properties. At low densities, the energy spectrum of
multilayer graphene is described by a set of chiral two-dimensional electron
systems and the associated chiral nature determines the screening properties of
multilayer graphene showing very different behavior depending on whether the
chirality index is even or odd. As density increases, the energy spectrum
follows that of the monolayer graphene and thus the polarizability approaches
that of monolayer graphene. The qualitative dependence of graphene
polarizability on chirality and layering indicates the possibility of distinct
graphene quantum phases as a function of the chirality index.

View original: http://arxiv.org/abs/1202.2132