The effect of disorder in superfluid graphene bilayers

An excitonic superfluid is predicted to form in a bilayer graphene system at room temperature. The superfluid requires a very precise configuration to form, as two graphene layers must be separated by an oxide no more than a few nanometers thick. As such, it is imperative to study the effects of lattice defects inevitably arising during the fabrication process. We present and compare the performance characteristics of both ideal and disordered bilayer graphene systems at room temperature. We perform quantum transport calculations on graphene bilayers using the non-equilibrium Greens function (NEGF) formalism in an effort to elucidate the evolution of a Bose-Einstein Condensate under non-equilibrium conditions in the presence of lattice defects. We find that lattice defects spread throughout the channel have little effect on the device performance, but vacancies concentrated near the contacts cause a considerable reduction in device performance.