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physics.optics2021★ 2 cited
Observation of Square-Root Higher-Order Topological States in Photonic Waveguide Arrays
Juan Kang, Tao Liu, Mou Yan +7
Recently, high-order topological insulators (HOTIs), accompanied by topologically nontrivial boundary states with codimension larger than one, have been extensively explored becaus…
physics.optics2018★ 1 cited
Broad-Band Negative Refraction via Simultaneous Multi-Electron Transitions
Jing-Jing Cheng, Ying-Qi Chu, Tao Liu +4
We analyze different factors which influence the negative refraction in solids and multi-atom molecules. We find that this negative refraction is significantly influenced by simult…