Observation of quadruple Weyl point in hybrid-Weyl phononic crystals
Observation of quadruple Weyl point in hybrid-Weyl phononic crystals
Here we report the observation of the quadruple Weyl point of charge 4 in phononic crystals, the highest topological charge a twofold degenerate node can carry. Besides the quadruple Weyl point, the phononic semimetal also hosts the conventional, quadratic, and spin-1 Weyl points, which stands as a system with yet …