Collapse of Landau levels in graphene under uniaxial strain

Abstract

We examine the collapse of Landau levels in graphene under uniform uniaxial strain and in the presence of a pair of crossed homogeneous electric and magnetic fields. In particular, we obtain the Landau levels and examine their dependence on the strain . It is shown that the Landau levels collapse when the magnitude of the electric field E reaches a critical value Ec whose magnitude can be increased (decreased) by applying the strain in the zigzag (armchair) direction. We also examine the phenomena in the presence of crossed inhomogeneous fields.