A second wave of topological phenomena in photonics and acoustics

Xiujuan Zhang, Farzad Zangeneh-Nejad, Ze-Guo Chen, Ming-Hui Lu () and Johan Christensen ()
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Xiujuan Zhang: Nanjing University
Farzad Zangeneh-Nejad: Hitachi ABB Power Grids Research Center
Ze-Guo Chen: Nanjing University
Ming-Hui Lu: Nanjing University
Johan Christensen: IMDEA Materials Institute

Nature, 2023, vol. 618, issue 7966, 687-697

Abstract: Abstract Light and sound are the most ubiquitous forms of waves, associated with a variety of phenomena and physical effects such as rainbows and echoes. Light and sound, both categorized as classical waves, have lately been brought into unexpected connections with exotic topological phases of matter. We are currently witnessing the onset of a second wave of active research into this topic. The past decade has been marked by fundamental advances comprising two-dimensional quantum Hall insulators and quantum spin and valley Hall insulators, whose topological properties are characterized using linear band topology. Here, going beyond these conventional topological systems, we focus on the latest frontiers, including non-Hermitian, nonlinear and non-Abelian topology as well as topological defects, for which the characterization of the topological features goes beyond the standard band-topology language. In addition to an overview of the current state of the art, we also survey future research directions for valuable applications.

Date: 2023
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DOI: 10.1038/s41586-023-06163-9

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