Classical topological phases derived from point degeneracies in photonic bandstructures show intriguing and unique behaviour. Previously identified exceptional points are based on accidental degeneracies and subject to engineering on a case-by-case basis. Here we show that symmetry induced (deterministic) pseudo Weyl points with non-trivial topology and hyper-conic dispersion exist at the centre of the Brillouin zone of chiral cubic systems. We establish the physical implications by means of a P213 sphere packing, realised as a nano plasmonic system and a photonic crystal.
@article{arxiv.1706.06030,
title = {A group theoretical route to deterministic Weyl points in chiral photonic lattices},
author = {Matthias Saba and Joachim M. Hamm and Jeremy J. Baumberg and Ortwin Hess},
journal= {arXiv preprint arXiv:1706.06030},
year = {2017}
}