Valley-Hall-like photonic topological insulators with vanishing Berry curvature
Year: 2019
Type: preprint
Abstract: Valley-Hall-like photonic topological insulators are designed inkagome-lattice photonic crystals with C3v point-group symmetry. The photonic
crystal consists of circular air holes in pure dielectric materials. Different
from conventional valley-Hall photonic topological insulators with nonvanishing
Berry curvature and valley Chern numbers, the proposed insulators have
vanishing Berry curvature and their topological invariants are described by a
quantized electric polarization. Topological transition can be realized by
tuning the structural size and topological edge states appear at the interface
between photonic crystals with different topological phases. Numerical analyses
show the proposed insulators preserve important features of valley-Hall
photonic insulators such as valley transport with little backscattering.
Source: arXiv (Cornell University)
Authors: Le Zhang, Sanshui Xiao
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2920995749