Many-body Resonance in a Correlated Topological Kagome Antiferromagnet

Abstract

We use scanning tunneling microscopy/spectroscopy (STM/S) to elucidate the atomically resolved electronic structure in strongly correlated topological kagome magnet Mn${}_3$Sn. In stark contrast to its broad single-particle electronic structure, we observe a pronounced resonance with a Fano line shape at the Fermi level resembling the many-body Kondo resonance. We find that this resonance does not arise from the step edges or atomic impurities, but the intrinsic kagome lattice. Moreover, the resonance is robust against the perturbation of a vector magnetic field, but broadens substantially with increasing temperature, signaling strongly interacting physics. We show that this resonance can be understood as the result of geometrical frustration and strong correlation based on the kagome lattice Hubbard model. Our results point to the emergent many-body resonance behavior in a topological kagome magnet.

Includes Supplementary Materials. To appear in Phys. Rev. Lett (2020)

References in corpus (4)

• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Electron Cotunneling into a Kondo Lattice
• The Fano effect in the point contact spectroscopy of heavy electron materials

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• Perspective: imaging atomic step geometry to determine surface terminations of kagome materials and beyond
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• Mott-Derived Local Moments and Kondo Hybridization in a d-electron Kagome lattice
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