Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet

Abstract

Owing to the unusual geometry of kagome lattices-lattices made of corner-sharing triangles-their electrons are useful for studying the physics of frustrated, correlated and topological quantum electronic states. In the presence of strong spin-orbit coupling, the magnetic and electronic structures of kagome lattices are further entangled, which can lead to hitherto unknown spin-orbit phenomena. Here we use a combination of vector-magnetic-field capability and scanning tunnelling microscopy to elucidate the spin-orbit nature of the kagome ferromagnet Fe3Sn2 and explore the associated exotic correlated phenomena. We discover that a many-body electronic state from the kagome lattice couples strongly to the vector field with three-dimensional anisotropy, exhibiting a magnetization-driven giant nematic (two-fold-symmetric) energy shift. Probing the fermionic quasi-particle interference reveals consistent spontaneous nematicity-a clear indication of electron correlation-and vector magnetization is capable of altering this state, thus controlling the many-body electronic symmetry. These spin-driven giant electronic responses go well beyond Zeeman physics and point to the realization of an underlying correlated magnetic topological phase. The tunability of this kagome magnet reveals a strong interplay between an externally applied field, electronic excitations and nematicity, providing new ways of controlling spin-orbit properties and exploring emergent phenomena in topological or quantum materials.

arXiv commentNature, online (2018)

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Cited by in corpus (189)

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• Topological kagome magnets and superconductors
• Progress and prospects in magnetic topological materials
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• Discovery of topological chiral crystals with helicoid arc states
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• Discovery of charge density wave in a correlated kagome lattice antiferromagnet
• Rotation symmetry breaking in the normal state of a kagome superconductor KV3Sb5
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• Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
• Weyl, Dirac and high-fold chiral fermions in topological quantum materials
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