Francois, NicolasXia, HuaPunzmann, HorstFontana, P. W.Shats, Michael2021-05-272021-05-27Francois, N., Xia, H., Punzmann, H. et al. Wave-based liquid-interface metamaterials. Nat Commun 8, 14325 (2017). https://doi.org/10.1038/ncomms143252041-1723http://hdl.handle.net/1885/234544The control of matter motion at liquid-gas interfaces opens an opportunity to create two-dimensional materials with remotely tunable properties. In analogy with optical lattices used in ultra-cold atom physics, such materials can be created by a wave field capable of dynamically guiding matter into periodic spatial structures. Here we show experimentally that such structures can be realized at the macroscopic scale on a liquid surface by using rotating waves. The wave angular momentum is transferred to floating micro-particles, guiding them along closed trajectories. These orbits form stable spatially periodic patterns, the unit cells of a two-dimensional wave-based material. Such dynamic patterns, a mirror image of the concept of metamaterials, are scalable and biocompatible. They can be used in assembly applications, conversion of wave energy into mean two-dimensional flows and for organising motion of active swimmers.This work was supported by the Australian Research Council’s Discovery Projects funding scheme (DP150103468 and DP160100863). H.X. acknowledges support from the Australian Research Council’s Future Fellowship (FT140100067). N.F. acknowledges support by the Australian Research Council’s DECRA award (DE160100742).application/pdfen-AU© 2017 The Author(s)http://creativecommons.org/licenses/by/4.0/2017-02-0910.1038/ncomms143252020-11-23Creative Commons Attribution 4.0 International License