Superconducting transport through InAs/GaSb heterostructures

Type-II InAs/GaSb heterostructures have recently attracted interest as a two-dimensional topological insulator that can be tuned between the normal and topological quantum phases by means of electrostatic gating. In proximity to a superconductor, 2D topological insulators are predicted to host Majorana zero-modes, a consequence of the helical nature of their edge conduction modes. Here, we present transport measurements through SNS junctions based on InAs/GaSb with NbTiN superconducting contacts. We observe induced supercurrents and investigate the effects of gating and applied magnetic fields, highlighting the potential for Majorana-detection experiments in this system.