Dynamically-created Josephson Junctions in thin layers of NbSe2

Niobium Diselenide (NbSe2) is a member of the transition metal dichalcogenides (TMDs) family which displays superconducting properties and is host to charge density waves (CDWs) down to its monolayer limit. These properties alongside its hexagonal structure make it an interesting material to study physics within its two dimensional limit. Here, we report on fabrication and low-temperature transport measurements of atomically-thin layers of NbSe2 in four terminal-configurations. We observe the formation of phase slip lines across our NbSe2 sheets which appear as non-zero resistances in the superconducting state. The formation of the phase slip lines dynamically creates Josephson junctions (JJs) . We interact with these dynamically-created JJs through the application of RF and magnetic fields. Interestingly, we observe a deviation from the conventional behavior of JJs in the presence of RF and a skewed Fraunhofer pattern in the presence of a magnetic field. We model our observations in the presence of RF by assuming a coupling of a JJ to a CDW. We found that the dynamics of the CDW influence the behavior of the JJ to produce results that qualitatively agree with our experiment.