Non-vanishing Fraunhofer Pattern in WTe₂ Josephson Junction

WTe₂ is predicted to host Weyl nodes at the contact of electron and hole pockets in a momentum space (Type-II Weyl semimetal) and exhibit novel transport properties. We fabricated proximity Josephson junctions based on mechanically exfoliated WTe₂ layers of thickness around 10-20 nm and studied their Josephson effects under magnetic field. Josephson critical current modulation as a function of perpendicular magnetic field, Ic(B), (so-called Fraunhofer pattern) exhibited non-vanishing lobes up to ~300 Gauss when Josephson current direction is parallel to a-axis of WTe₂ crystal. This indicates that Josephson current through a-axis of WTe₂ layer has enhanced contribution from the edges of the flake. However, flowing Josephson current parallel to b-axis of WTe₂ resulted in ordinary Fraunhofer pattern. We will discuss about observed anisotropic quantum transport of WTe₂ Josephson junction in regard to its topological nature.