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Kagome lattice hosts a plethora of quantum states arising from the interplayof topology, spin-orbit coupling, and electron correlations. Here, we reportsymmetry-breaking electronic orders tunable by an applied magnetic field in amodel Kagome magnet FeSn consisting of alternating stacks of two-dimensionalFe3Sn Kagome and Sn2 honeycomb layers. On the Fe3Sn layer terminated FeSn thinfilms epitaxially grown on SrTiO3(111) substrates, we observe trimerization ofthe Kagome lattice using scanning tunneling microscopy/spectroscopy, breakingits six-fold rotational symmetry while preserving the transitional symmetry.Such a trimerized Kagome lattice shows an energy-dependent contrast reversal indI/dV maps, which is significantly enhanced by bound states induced by Snvacancy defects. This trimerized Kagome lattice also exhibits stripemodulations that are energy-dependent and tunable by an applied in-planemagnetic field, indicating symmetry-breaking nematicity from the entangledmagnetic and charge degrees of freedom in antiferromagnet FeSn.

Visualizing symmetry-breaking electronic orders in epitaxial Kagome magnet FeSn films