Weak localization in monolayer and bilayer graphene
Abstract.We describe the weak localization correction to
conductivity in ultra-thin graphene films, taking into account
disorder scattering and the influence of trigonal warping of the
Fermi surface. A possible manifestation of the chiral nature of
electrons in the localization properties is hampered by trigonal
warping, resulting in a suppression of the weak anti-localization
effect in monolayer graphene and of weak localization in bilayer
graphene. Intervalley scattering due to atomically sharp
scatterers in a realistic graphene sheet or by edges in a narrow
wire tends to restore weak localization resulting in negative
magnetoresistance in both materials.