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Scatterings and transport in Weyl semimetals have caught growing attention incondensed matter physics, with observables including chiral zero modes and theassociated magnetoresistance and chiral magnetic effects. Measurement ofelectrical conductance is usually performed in these studies, which, however,cannot resolve the momentum of electrons, preventing direct observation of thephase singularities in scattering matrix associated with Weyl point. Here weexperimentally demonstrate a helical phase distribution in the angle (momentum)resolved scattering matrix of electromagnetic waves in a photonic Weylmetamaterial. It further leads to spiraling Fermi arcs in an air gap sandwichedbetween a Weyl metamaterial and a metal plate. Benefiting from thealignment-free feature of angular vortical reflection, our findings establish anew platform in manipulating optical angular momenta with photonic Weylsystems.

Vortical Reflection and Spiraling Fermi Arcs with Weyl Metamaterials