Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV${}_6$Sn${}_6$

Abstract

Transition-metal-based kagome materials at van Hove filling are a rich frontier for the investigation of novel topological electronic states and correlated phenomena. To date, in the idealized two-dimensional kagome lattice, topologically nontrivial Dirac surface states (TDSSs) have not been unambiguously observed, and the manipulation of TDSSs and van Hove singularities (VHSs) remains largely unexplored. Here, we reveal TDSSs originating from a Z${}_2$ bulk topology and identify multiple VHSs near the Fermi level ($\text{E}$${}_F$) in magnetic kagome material GdV${}_6$Sn${}_6$. Using in-situ surface potassium deposition, we successfully realize manipulation of the TDSSs and VHSs. The Dirac point of the TDSSs can be tuned from above to below ($\text{E}$${}_F$), which reverses the chirality of the spin texture at the Fermi surface. These results establish GdV${}_6$Sn${}_6$ as a fascinating platform for studying the nontrivial topology, magnetism and correlation effects native to kagome lattices. They also suggest potential application of spintronic devices based on kagome materials.

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Cited by in corpus (50)

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• Optical spectroscopy and band structure calculations of structural phase transition in the Vanadium-based kagome metal ScV${}_6$Sn${}_6$
• Flat band separation and robust spin-Berry curvature in bilayer kagome metals
• Phonon promoted charge density wave in topological kagome metal ScV${}_6$Sn${}_6$
• Quantum Interactions in Topological R166 Kagome Magnet
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• Quantum oscillations revealing topological band in kagome metal ScV6Sn6
• Dynamics and Resilience of the Charge Density Wave in a bilayer kagome metal
• Intrinsic Magnetic Topological Materials
• High-order Van Hove singularities and their connection to flat bands
• The discovery of three-dimensional Van Hove singularity
• Tunable magnetism and electron correlation in Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) by rare-earth engineering
• Universal sublinear resistivity in vanadium kagome materials hosting charge density waves
• Observation of flat and weakly dispersing bands in a van der Waals semiconductor Nb3Br8 with breathing kagome lattice
• Origin and stability of the charge density wave in ScV${}_6$Sn${}_6$
• Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi3Bi4
• Electrical and thermal transport properties of kagome metals $A$Ti${}_3$Bi${}_5$ ($A$ = Rb, Cs)
• Magnetic-coupled electronic landscape in bilayer-distorted titanium-based kagome metals
• Quantum oscillations in kagome metals (Ti, Zr, Hf)V6Sn6 at Van Hove filling
• Kagome metals
• Low-Energy Electronic Structure in the Unconventional Charge-Ordered State of ScV${}_6$Sn${}_6$
• Electronic band structures of topological kagome materials
• Prediction of Van Hove singularity systems in ternary borides
• The role of electron correlations in the electronic structure of putative Chern magnet TbMn${}_6$Sn${}_6$
• Ground-state magnetic structures of topological kagome metals RV${}_6$Sn${}_6$ (R = Tb, Dy, Ho, Er)
• Tunable interface states between Floquet-Weyl semimetals
• Three-dimensional higher-order saddle points induced flat bands in Co-based kagome metals
• Kagome surface states and weak electronic correlation in vanadium-kagome metals
• Quantum Oscillations Evidence for Topological Bands in Kagome Metal ScV6Sn6
• Giant coercivity and enhanced intrinsic anomalous Hall effect at vanishing magnetization in a compensated kagome ferrimagnet
• $T_3$Pb${}_{2}C{h}_2$ ($T$=Pd,Pt and $Ch$=S,Se) with transition metal kagome net: Dynamical properties, phonon nodal line, phonon surface states, and chiral phonons
• Fermi surface of magnetic kagome compound GdV6Sn6 investigated using de Haas van Alphen Oscillations
• Origin of competing charge density waves in kagome metal ScV${}_6$Sn${}_6$
• MPd5 kagome superconductors studied by density functional calculations
• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• Kagome Metal GdNb${}_6$Sn${}_6$: A 4d Playground for Topological Magnetism and Electron Correlations
• Discovery of an Intermediate Nematic State in a Bilayer Kagome Metal ScV6Sn6
• Competing Lattice Instability and Magnetism on the Surface of Kagome Metals
• Correlation stabilized ferromagnetic MnRuAs with distorted kagome lattice
• Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV${}_6$Sn${}_6$
• Topological Aspects of Dirac Fermions in a Kagomé Lattice
• Tunable topological phase in 2D ScV${}_6$Sn${}_6$ kagome material
• Nature of quantum criticality in the Ising ferromagnet TbV${}_6$Sn${}_6$
• Structural modulation, physical properties, and electronic band structure of the kagome metal UCr${}_6$Ge${}_6$
• Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV6Sn6 via Nd substitution
• Effect of superconductivity by Nb and V substitution in kagome CaPd5
• Revealing magnetism in the distorted kagome $R$Ti${}_3$Bi${}_4$ ($R$ = Nd, Sm, Gd) via ARPES and XMCD