武汉大学主页平台管理系统 Xiao Meng--English-- Photonic realization of chiral hinge states in a Chern-insulator stack

Personal Information

Journal:
Physical Review B
Abstract:
Higher-order topological insulators, as a novel family of topological phases, are a hot frontier in condensed-matter physics and classical waves due to their adherence to unconventional bulk-boundary correspondence. A three-dimensional second-order topological insulator can support one-dimensional modes along its hinges (dubbed “hinge states”). Here, we present a simple and direct method to construct chiral hinge modes based on a Chern-insulator stack. We analyze the existence of the hinge modes through the nontrivial quadrupole indices and then design a photonic antiferromagnetic crystal to realize the specific flowing pattern of the hinge mode in our model. The experimental results align well with full-wave simulations, clearly demonstrating the existence of chiral hinge states. We also verify the robustness of these hinge states against defects in our photonic system.
Volume:
111
Issue:
4
Page Number:
L041112
Translation or Not:
no
Date of Publication:
2025-01-15