Tunable quantum dots in monolayer graphene

Abstract

We examine a graphene quantum dot formed by combining an electric and a\nuniform magnetic field. The electric field creates a smooth quantum well\npotential while the magnetic field induces an exponential tail to the dot\nstates. The states peak in the well and the electrostatic barrier region as a\nresult of the Klein tunneling effect. Coupling between dot states which peak in\ndifferent regions can be achieved with the electric and magnetic fields. The\ntunability of this dot with moderate external fields could be used for\ndesigning quantum devices in monolayer graphene.\n