An investigation was made of  the superfluid properties of disordered double layer graphene systems using the non-equilibrium Green's function formalism. The complexity of such a structure makes it imperative to study the effects of lattice vacancies which will inevitably arise during fabrication. Room-temperature performance characteristics were compared for both ideal and disordered double layer graphene systems in order to illustrate the behaviour of a Bose-Einstein condensate in the presence of lattice defects under non-equilibrium conditions. It was found that lattice vacancies spread throughout the top layer past the coherence length have a reduced effect compared to the ideal case. However, vacancies concentrated near the metal contacts within the coherence length significantly alter the interlayer superfluid transport properties.

The Effect of Disorder in Superfluid Double Layer Graphene. B.Dellabetta, M.J.Gilbert: Journal of Physics - Condensed Matter, 2011, 23[34], 345302