Hyperbolic Weyl Point in Reciprocal Chiral Metamaterials

Phys Rev Lett. 2016 Jul 29;117(5):057401. doi: 10.1103/PhysRevLett.117.057401. Epub 2016 Jul 27.


We report the existence of Weyl points in a class of noncentral symmetric metamaterials, which has time reversal symmetry, but does not have inversion symmetry due to chiral coupling between electric and magnetic fields. This class of metamaterial exhibits either type-I or type-II Weyl points depending on its nonlocal response. We also provide a physical realization of such metamaterial consisting of an array of metal wires in the shape of elliptical helices which exhibits type-II Weyl points.