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- W4385890343 abstract "Weyl points are three-dimensional linear points between bands that exhibit unique stability to perturbations and are accompanied by topologically non-trivial surface states. However, the discovery and control of Weyl points in nature poses significant challenges. While recent advances have allowed for engineering Weyl points in photonic crystals and metamaterials, the topological transition between Weyl semimetals with distinct types of Weyl points remains yet to be reported. Here, exploiting the flexible measurement-feedback control of synthetic mechanical systems, we experimentally simulate Weyl semimetals and observe for the first time the transition between states with type-I and type-II Weyl points. We directly observe the change in the band structures accompanying the transition and identify the Fermi arc surface states connecting the Weyl points. Further, making use of the non-reciprocal feedback control, we demonstrate that the introduction of non-Hermiticity significantly impacts the topological transition point, as well as the edge localization of the Fermi arc surface states. Our findings offer valuable insights into the design and realization of Weyl points in mechanical systems, providing a promising avenue for exploring novel topological phenomena in non-Hermitian physics." @default.
- W4385890343 created "2023-08-17" @default.
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- W4385890343 date "2023-08-15" @default.
- W4385890343 modified "2023-09-27" @default.
- W4385890343 title "Observation of Topological Weyl Type I-II Transition in Synthetic Mechanical Lattices" @default.
- W4385890343 doi "https://doi.org/10.48550/arxiv.2308.07853" @default.
- W4385890343 hasPublicationYear "2023" @default.
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