Observation of topological Euler insulators with a trapped-ion quantum simulator

  title={Observation of topological Euler insulators with a trapped-ion quantum simulator},
  author={W.-D. Zhao and Y-B Yang and Y. Jiang and Z.-C. Mao and W.-X. Guo and L-Y Qiu and G.-X. Wang and L. Yao and L. He and Z.-C. Zhou and Y. Xu and Luming Duan},
Symmetries play a crucial role in the classification of topological phases of matter. Although recent studies have established a powerful framework to search for and classify topological phases based on symmetry indicators, there exists a large class of fragile topology beyond the description. The Euler class characterizing the topology of two-dimensional real wave functions is an archetypal fragile topology underlying some important properties, such as non-Abelian braiding of crossing nodes and… 

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