Imaging local supercurrent density in planar Josephson junction (part 2)

Josephson junctions are programmable building blocks useful in applications in quantum computing and fundamental research such as topological superconductivity. The conventional approach for measuring such junctions uses dc transport focusing on the oscillatory critical current. While effective, this approach is insensitive to features in the zero-resistance state. In this talk, we present recent measurements using a scanning NV magnetometer to image the supercurrent flow in a Josephson Junction. Our results reveal competing ground states that depend on temperature and the external flux.