Orateur
Description
Many superconducting systems behave as Josephson-junction arrays (JJAs), either intrinsically or via disorder-induced weak links near the critical temperature. Artificial JJAs suppress disorder, making them an optimal model system for various condensed matter states, such as the superconductor-insulator transition. Since phase coherence is the dominant factor in JJAs, it is crucial to develop methods for measuring phase information locally. Here, we use scanning superconducting quantum interference device (SQUID) microscopy to map phase information in square-lattice hybrid JJAs. We locally measure the super-currents and follow them as we apply local and global magnetic fields to generate periodic phase patterns, locally disrupt phase coherence and trigger phase slips. We use this local current-phase relations measurement to resolve phase information directly.