Flat band separation and robust spin-Berry curvature in bilayer kagome metals

Abstract

Kagome materials have emerged as a setting for emergent electronic phenomena that encompass different aspects of symmetry and topology. It is debated whether the XV${}_6$Sn${}_6$ kagome family (where X is a rare earth element), a recently discovered family of bilayer kagome metals, hosts a topologically non-trivial ground state resulting from the opening of spin-orbit coupling gaps. These states would carry a finite spin-Berry curvature, and topological surface states. Here, we investigate the spin and electronic structure of the XV${}_6$Sn${}_6$ kagome family. We obtain evidence for a finite spin-Berry curvature contribution at the center of the Brillouin zone, where the nearly flat band detaches from the dispersing Dirac band because of spin-orbit coupling. In addition, the spin-Berry curvature is further investigated in the charge density wave regime of ScV${}_6$Sn${}_6$, and it is found to be robust against the onset of the temperature-driven ordered phase. Utilizing the sensitivity of angle resolved photoemission spectroscopy to the spin and orbital angular momentum, our work unveils the spin-Berry curvature of topological kagome metals, and helps to define its spectroscopic fingerprint.

21 pages, 4 figures

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Cited by in corpus (27)

• Quantum oscillations revealing topological band in kagome metal ScV6Sn6
• Dynamics and Resilience of the Charge Density Wave in a bilayer kagome metal
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Colossal orbital Zeeman effect driven by tunable spin-Berry curvature in a kagome metal
• Floquet engineering of topological phase transitions in quantum spin Hall $\alpha$-$T_3$ system
• Signatures of a surface spin-orbital chiral metal
• Kagome metals
• Electronic band structures of topological kagome materials
• Bilayer orthogonal ferromagnetism in CrTe${}_2$-based van der Waals system
• Order-by-disorder charge density wave condensation at $\text{q}=(\frac{1}{3},\frac{1}{3},\frac{1}{3})$ in kagome metal ScV${}_6$Sn${}_6$
• 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
• Quantum Oscillations Evidence for Topological Bands in Kagome Metal ScV6Sn6
• Kagome surface states and weak electronic correlation in vanadium-kagome metals
• Frustrated Ising charge correlations in the kagome metal ScV${}_6$Sn${}_6$
• Origin of competing charge density waves in kagome metal ScV${}_6$Sn${}_6$
• Fermi surface of magnetic kagome compound GdV6Sn6 investigated using de Haas van Alphen Oscillations
• Uncovering the lowest thickness limit for room-temperature ferromagnetism of Cr${}_{1.6}$Te${}_2$
• The electronic structure of intertwined kagome, honeycomb, and triangular sublattices of the intermetallics MCo${}_2$Al${}_9$
• Competing Lattice Instability and Magnetism on the Surface of Kagome Metals
• Optical Signature of Flat Bands in Topological Hourglass Semimetal Nb3SiTe6
• Observation of Resonance of Kagome Flat Band Doublet
• Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV${}_6$Sn${}_6$
• Magnetism of kagome metals $\left({\text{Fe}}_{1-x}{\text{Co}}_x\right)\text{Sn}$ studied by $\mu$SR
• Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV6Sn6 via Nd substitution
• Kagome edge states under lattice termination, spin-orbit coupling, and magnetic order
• Singular flat bands in three dimensions: Landau level spreading, quantum geometry, and Weyl reconstruction