Nonlinear control of photonic higher-order topological bound states in the continuum

  title={Nonlinear control of photonic higher-order topological bound states in the continuum},
  author={Zhichan Hu and Domenico Bongiovanni and Dario Juki'c and Ema Jajti{\'c} and Shiqi Xia and Daohong Song and Jingjun Xu and Roberto Morandotti and Hrvoje Buljan and Zhigang Chen},
  journal={Light, Science \& Applications},
Higher-order topological insulators (HOTIs) are recently discovered topological phases, possessing symmetry-protected corner states with fractional charges. An unexpected connection between these states and the seemingly unrelated phenomenon of bound states in the continuum (BICs) was recently unveiled. When nonlinearity is added to the HOTI system, a number of fundamentally important questions arise. For example, how does nonlinearity couple higher-order topological BICs with the rest of the… 
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