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Kagome lattices host flat bands due to their frustrated lattice geometry, which leads to destructive quantum interference of electron wave functions. Here, we report imaging of the kagome flat band localization in real-space using scanning tunneling microscopy. We identify both the Fe₃Sn kagome lattice layer and the Sn₂honeycomb layer with atomic resolution in kagome antiferromagnet FeSn. On the Fe₃Sn lattice, at the flat band energy determined by the angle resolved photoemission spectroscopy, tunneling spectroscopy detects an unusual state localized uniquely at the Fe kagome lattice network. We further show that the vectorial in-plane magnetic field manipulates the spatial anisotropy of the localization state within each kagome unit cell. Our results are consistent with the real-space flat band localization in the magnetic kagome lattice. We further discuss the magnetic tuning of flat band localization under the spin–orbit coupled magnetic kagome lattice model.

In the ciliate Tetrahymena thermophila, the BCD1 pattern-gene encodes a Beige-BEACH-domain protein that defines cortical organelle dimensions through regulated endocytic activity. Tetrahymena cells homozygous for a bcd1 loss-of-function mutation exhibit supernumerary cortical organelles including oral apparatuses, cytoprocts and contractile vacuole pores. Elements of the broadened cortical domain phenotype can be phenocopied by disrupting clathrin-mediated endocytosis, suggesting that exocytic membrane delivery is balanced by endocytic retrieval of cortical pattern determinants..