Localized spin-orbit polaron in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$

Abstract

The kagome lattice Co${}_3$Sn${}_2$S${}_2$ exhibits the quintessential topological phenomena of a magnetic Weyl semimetal such as the chiral anomaly and Fermi-arc surface states. Probing its magnetic properties is crucial for understanding this correlated topological state. Here, using spin-polarized scanning tunneling microscopy/spectroscopy (STM/S), we report the discovery of localized spin-orbit polarons (SOPs) with three-fold rotation symmetry nucleated around single-S vacancies in Co${}_3$Sn${}_2$S${}_2$. The SOPs carry a spin-polarized magnetic moment and a large orbital magnetization of a topological origin associated with the Berry phase and the persistent circulating current. Appreciable magneto-elastic coupling of the SOP is detected by atomic force microscope and STM. Our findings suggest that the SOPs can enhance magnetism and stability of the magnetic Weyl nodes for more robust time-reversal-symmetry-breaking topological phenomena. Controlled engineering of the SOPs may pave the way toward practical applications in functional quantum devices.

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• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Topological kagome magnets and superconductors
• Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV${}_3$Sb${}_5$
• Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5
• Intrinsic nature of chiral charge order in the kagome superconductor RbV3Sb5
• Probing topological quantum matter with scanning tunnelling microscopy
• Discovery of charge order and corresponding edge state in kagome magnet FeGe
• No observation of chiral flux current in the topological kagome metal CsV${}_3$Sb${}_5$
• Controllable dimensionality conversion between 1D and 2D CrCl3 magnetic nanostructures
• Phonon helicity induced by electronic Berry curvature in Dirac materials
• Electronic structure and topology across $T_c$ in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Manipulation of Dirac band curvature and momentum-dependent g-factor in a kagome magnet YMn6Sn6
• Discovery and construction of surface kagome electronic states induced by p-d electronic hybridization
• Spin-polarized imaging of the antiferromagnetic structure and field-tunable bound states in kagome magnet FeSn
• How correlations change the magnetic structure factor of the kagome Hubbard model
• Spin-orbital Jahn-Teller bipolarons
• Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films
• Evidence of a distinct collective mode in Kagome superconductors
• Atomically-precise engineering of spin-orbit polarons in a kagome magnetic Weyl semimetal
• Pressure-Driven Magneto-Topological Phase Transition in a magnetic Weyl semimetal
• Ground-state magnetic structures of topological kagome metals RV${}_6$Sn${}_6$ (R = Tb, Dy, Ho, Er)
• Perspective: imaging atomic step geometry to determine surface terminations of kagome materials and beyond
• Nodal vacancy bound states and resonances in three-dimensional Weyl semimetals
• Local excitation of kagome spin ice magnetism in HoAgGe seen by scanning tunneling microscopy
• Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet
• Anisotropic response of defect bound states to magnetic field in epitaxial FeSn films