Signatures for half-metallicity and nontrivial surface states in a Kagome-lattice magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$

Abstract

Weyl semimetals with time reversal symmetry breaking are expected to show various fascinating physical behaviors, such as intrinsic giant anomalous Hall effect, chiral anomaly effect in the bulks, and Fermi arcs on the surfaces. Here we report a scanning tunneling microscopy study on the magnetic Weyl semimetal candidate Co${}_3$Sn${}_2$S${}_2$. According to the morphology and local density of states of the surface, we provide assignments to different surface terminations. The measured local density of states reveals a semimetal gap of ~300 mV, which is further verified as the gap in spin-minority bands using spin-resolved tunneling spectra. Additionally, signature for the nontrivial surface states around 50 mV is proposed. This is further confirmed by the observations of standing waves around a step-edge of the sample. Our observations and their comparison with band structure calculations provide direct yet timely evidence for the bulk and surface band structures of the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$.

arXiv comment14 pages, 5 figures

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• Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
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• Localized spin-orbit polaron in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Quantum Interactions in Topological R166 Kagome Magnet
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• Many-body Resonance in a Correlated Topological Kagome Antiferromagnet
• Plethora of tunable Weyl fermions in kagome magnet Fe3Sn2 thin films
• First-principles investigation of magnetic and transport properties in hole-doped shandite compounds Co${}_3$In${}_x$Sn${}_{2-x}$S${}_2$
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• Endless Dirac nodal lines in kagome-metal Ni3In2S2
• Discovery and construction of surface kagome electronic states induced by p-d electronic hybridization
• Record-high Mobility and Extreme Magnetoresistance on Kagome-lattice in Compensated Semimetal Ni3In2S2
• Revealing the chemical bonding in adatoms arrays via machine learning of 3D scanning tunneling spectroscopy data
• Lateral Josephson effect on the surface of Co${}_3$Sn${}_2$S${}_2$ magnetic Weyl semimetal
• Topological Quasi-2D Semimetal Co${}_3$Sn${}_2$S${}_2$: Insights To Electronic Structure From NEXAFS and Resonant Photoelectron Spectroscopy
• Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films
• Microscopic origins and stability of the ferromagnetism in Co${}_3$Sn${}_2$S${}_2$
• Linear response theories for interatomic exchange interactions
• Perspective: imaging atomic step geometry to determine surface terminations of kagome materials and beyond
• Enhancement of Spin-Charge Conversion Efficiency for Co${}_3$Sn${}_2$S${}_2$ across Transition from Paramagnetic to Ferromagnetic Phase
• Observation of linearly dispersive edge modes in a magnetic Weyl semimetal Co3Sn2S2
• Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2
• Degenerate magnetic ground state and metastable state on trihexagonal Co-sublattices in Co3Sn2(S,Se)2 single crystals
• Spin-orbit quantum impurity in a topological kagome magnet
• Mesoscale variations of chemical and electronic landscape on the surface of Weyl semimetal Co${}_3$Sn${}_2$S${}_2$ visualized by ARPES and XPS