Switching Current Distributions in Josephson Junctions

Graphene is a perspective material with great potential for different nanoelectronics and nanomechanical applications because of its unique electrical properties. One of the important applications of graphene is using it as a barrier between two superconducting electrodes in a Josephson junction. Such junctions are called the Superconductor-Graphene-Superconductor (SGS) junctions and their experimental investigation is the main goal of this thesis. An important experimental characteristic of a SGS junction is the switching current probability distribution (SCD). SCD gives more insight into the intrinsic properties of the graphene-based Josephson junctions. In this work, a setup for measuring SCD was developed and tested with a well-known SIS junction. IV characteristics and SCD probability curves of a SGS junction were measured for temperatures 100mK−1.3K in close proximity to the charge neutrality point and far from it. The obtained characteristics provide valuable information about parameters of the junction and can be utilized for development of different nanodevices based on graphene