Topological bound modes in anti-PT-symmetric optical waveguide arrays Ke, Shaolin ; Zhao, Dong ; Liu, Jianxun ; Liu, Qingjie ; Liao, Qing ; Wang, Bing ; Lu, Peixiang Abstract Publication: Optics Express Pub Date: May 2019 DOI: 10.1364/OE.27.013858 Bibcode: 2019OExpr..2713858K