![Observation of Hofstadter butterfly and topological edge states in reconfigurable quasi-periodic acoustic crystals]()
Observation of Hofstadter butterfly and topological edge states in reconfigurable quasi-periodic acoustic crystalsNi, Xiang; Chen, Kai; Weiner, Matthew; Apigo, David J.; Prodan, Camelia; Alù, Andrea; Prodan, Emil; Khanikaev, Alexander B. · Communications Physics · 2019