Contact Resistance on Magic Angle Graphene—A Path Towards Photodetectors Based on Superconducting Graphene

Magic angle graphene superconducts at below ~2 K and has received much attention due to its gate-tunable superconductivity. Gate-defined Josephson junctions based on magic angle graphene have high dynamic resistance at zero bias. As such, they can be used to produce sensitive and fast photodetectors with proper antennas. Contact resistance is critically important for these applications because appropriate impedance matching must be achieved throughout.<br/><br/>We have measured contact resistances on magic angle graphene as a function of contacting area, contacting metals and contacting methods (edge or top) as a function of twist angle from 0.9 to 1.5 degrees, temperature and gate voltage. This paper will discuss results and compare our observations to what has been reported in single layer graphene devices. This work was supported by U. S. Army OSD Phase II STTR contract W911NF23C0027 and by matching funds from the Florida High Technology Corridor (I-4) Program.