Intraband electron focusing in bilayer graphene

Peterfalvi, Csaba and Oroszlany, Laszlo and Lambert, Colin and Cserti, Jozsef (2012) Intraband electron focusing in bilayer graphene. New Journal of Physics, 14. 063028. ISSN 1367-2630

Abstract

We propose an implementation of a valley selective electronic Veselago lens in bilayer graphene. We demonstrate that in the presence of an appropriately oriented potential step, low-energy electrons radiating from a point source can be re-focused coherently within the same band. The phenomenon is due to the trigonal warping of the band structure that leads to a negative refraction index. We show that the interference pattern can be controlled by an external mechanical strain.