The Effect of Disorder in Superfluid Double Layer Graphene

TL;DR

This paper studies how lattice vacancies affect superfluid transport in disordered double layer graphene using NEGF formalism, revealing that vacancies far from contacts have minimal impact, while those near contacts significantly alter transport.

Contribution

It provides a comparative analysis of superfluid properties in ideal and disordered bilayer graphene at room temperature, highlighting the effects of lattice vacancies on transport behavior.

Findings

Vacancies far from contacts have reduced impact on superfluid transport.

Vacancies near contacts significantly alter interlayer superfluid properties.

Disorder influences the robustness of superfluidity in graphene layers.

Abstract

We investigate the superfluid properties of disordered double layer graphene systems using the non-equilibrium Green's function (NEGF) formalism. The complexity of such a structure makes it imperative to study the effects of lattice vacancies which will inevitably arise during fabrication. We present and compare room temperature performance characteristics for both ideal and disordered bilayer graphene systems in an effort to illustrate the behavior of a Bose-Einstein Condensate in the presence of lattice defects under non-equilibrium conditions. We find 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.