Topological corner states characteristic to second-order topological phases are observed on the surface of a solid using a scanning tunnelling microscope. This observation opens a new connection between higher-order topological physics and surface science.
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Ezawa, M. Protected corners. Nat. Mater. 18, 1266–1267 (2019). https://doi.org/10.1038/s41563-019-0534-x
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DOI: https://doi.org/10.1038/s41563-019-0534-x
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