Main . Vortices with defined topological features are a ubiquitous phenomenon in physics, appearing in different systems including superconductors1, superfluids2, exciton polaritons3and magnetic materials4. Recently, propagating vortex beams characterized by twisted helical wavefronts carrying intrinsic orbital angular momentum (OAM) have been realized with electrons5, neutrons6and helium atoms7, providing a new emerging tool for the investigatio...