Type-II Dirac Photons
Abstract
The Dirac equation for relativistic electron waves is the parent model for Weyl and Majorana fermions as well as topological insulators. Simulation of Dirac physics in three-dimensional photonic crystals, though fundamentally important for topological phenomena at optical frequencies, encounters the challenge of synthesis of both Kramers double degeneracy and parity inversion. Here we show how type-II Dirac points---exotic Dirac relativistic waves yet to be discovered---are robustly realized through the nonsymmorphic screw symmetry. The emergent type-II Dirac points carry nontrivial topology and are the mother states of type-II Weyl points. The proposed all-dielectric architecture enables robust cavity states at photonic-crystal---air interfaces and anomalous refraction, with very low energy dissipation.
Cite
@article{arxiv.1703.09899,
title = {Type-II Dirac Photons},
author = {Hai-Xiao Wang and Yige Chen and Zhi Hong Hang and Hae-Young Kee and Jian-Hua Jiang},
journal= {arXiv preprint arXiv:1703.09899},
year = {2017}
}