Tunneling spectroscopy in planar Josephson junctions*

Planar Josephson junction based on two-dimensional electron gas (2DEG) with strong spin-orbit coupling, large g-factor and induced superconductivity is a promising platform to realize topological superconductivity and Majorana zero modes. Here we fabricate planar Josephson junctions on InAs 2DEG with epitaxial Al Contacts. Two tunneling probes are added to the ends of the junction to probe the density of states of edge modes. In a trivial regime, we show that we can screen devices and identify hard induced superconducting gaps in the junction. By application of an in-plane magnetic field the system is expected to make a transition to topological regime. We will present the induced gap and low-energy states measured at the two ends of the junction simultaneously as a function of the in-plane magnetic field,  the angle between the magnetic field and the junction.