Local Control of Supercurrent Density in Epitaxial Al-InAs Josepshon Junctions

Gate tunable Josephson junctions (JJs) made from two dimensional electron gas can host topological superconductivity, a unique property that can be used for fault tolerant topological quantum computation. In planar Josephson junctions the carrier density and, therefore the overall current distribution could be modified electrostatically via metallic gates. In this work, by applying an out-of-plane magnetic field to an epitaxial Al-InAs JJ equipped with five mini-gates, we have extracted the spatial current distribution of our devices. We demonstrate that not only can the junction width be electrostatically defined and varied but also we can locally adjust the current profile to form superconducting quantum interference devices. Our studies show enhanced edge conduction in the junctions, which can be eliminated by mini-gates to create a uniform current distribution. The ability to locally tune the current distribution width of the junction could open a path for studying topological superconductivity in Josephson junctions.