Observation of protected localized states induced by curved space in acoustic topological insulators

Theory of light propagation in arbitrary two-dimensional curved space

“…Ever since this notion was put forward by Batz and Peschel [10] in 2008, various optical phenomena have been reported both theoretically [10][11][12][13][14][15][16][17][18] and experimentally [19][20][21][22][23]. Besides optics and photonics, similar studies on curved surfaces have also been extended to surface plasmon polaritons [24], acoustic topological insulators [25] and quantum particles [26].…”