second Chern number

Wednesday, March 15, 2017 - 9:00am - 9:50am
Ling Lu (Chinese Academy of Sciences)
We propose topological one-way fibers enabled by the recently discovered Weyl points in a double- gyroid (DG) photonic crystal. By annihilating two Weyl points by supercell modulation in a mag- netic DG, we obtain the photonic analogue of the 3D quantum Hall phase with a non-zero first Chern number (C1). When the modulation becomes helixes, one-way fiber modes develop along the winding axis, with the number of modes determined by the spatial frequency of the helix.
Subscribe to RSS - second Chern number