Magnetic-coupled electronic landscape in bilayer-distorted titanium-based kagome metals

Abstract

Quantum materials whose atoms are arranged on a lattice of corner-sharing triangles, $\text{i.e.}$, the kagome lattice, have recently emerged as a captivating platform for investigating exotic correlated and topological electronic phenomena. Here, we combine ultra-low temperature angle-resolved photoemission spectroscopy (ARPES) with scanning tunneling microscopy and density functional theory calculations to reveal the fascinating electronic structure of the bilayer-distorted kagome material $\text{Ln}$Ti${}_3$Bi${}_4$, where $\text{Ln}$ stands for Nd and Yb. Distinct from other kagome materials, $\text{Ln}$Ti${}_3$Bi${}_4$ exhibits two-fold, rather than six-fold, symmetries, stemming from the distorted kagome lattice, which leads to a unique electronic structure. Combining experiment and theory we map out the electronic structure and discover double flat bands as well as multiple van Hove singularities (VHSs), with one VHS exhibiting higher-order characteristics near the Fermi level. Notably, in the magnetic version NdTi${}_3$Bi${}_4$, the ultra-low base temperature ARPES measurements unveil an unconventional band splitting in the band dispersions which is induced by the ferromagnetic ordering. These findings reveal the potential of bilayer-distorted kagome metals $\text{Ln}$Ti${}_3$Bi${}_4$ as a promising platform for exploring novel emergent phases of matter at the intersection of strong correlation and magnetism.

References in corpus (28)

• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Massive Dirac fermions in a ferromagnetic kagome metal
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Dirac fermions and flat bands in the ideal kagome metal FeSn
• Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2
• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Topological kagome magnets and superconductors
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Competing electronic orders on Kagome lattices at van Hove filling
• Sublattice Interference in the Kagome Hubbard Model
• Nature of unconventional pairing in the kagome superconductors AV${}_3$Sb${}_5$
• Rich Nature of Van Hove Singularities in Kagome Superconductor CsV${}_3$Sb${}_5$
• Novel magnetic states and nematic spin chirality in the kagome lattice metal YMn${}_6$Sn${}_6$
• Charge density wave in kagome lattice intermetallic ScV6Sn6
• Quantum states and intertwining phases in kagome materials
• Rare earth engineering in RMn${}_6$Sn${}_6$ topological kagome magnets
• Study of the electronic properties of topological kagome metals YV${}_6$Sn${}_6$ and GdV${}_6$Sn${}_6$
• Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV${}_6$Sn${}_6$
• Electronic nematicity without charge density waves in titanium-based kagome metal
• Non-trivial band topology and orbital-selective electronic nematicity in a new titanium-based kagome superconductor
• Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments
• Evolution of highly anisotropic magnetism in the titanium-based kagome metals LnTi${}_3$Bi${}_4$ (Ln: La...Gd${}^{3+}$, Eu${}^{2+}$, Yb${}^{2+}$)
• Electronic Landscape of Kagome Superconductors $\text{A}$V${}_3$Sb${}_5$ ($\text{A}$ = K, Rb, Cs) from Angle-Resolved Photoemission Spectroscopy
• Tunable magnetism and electron correlation in Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) by rare-earth engineering
• Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi3Bi4

Cited by in corpus (7)

• Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4
• Spectroscopic origin of giant anomalous Hall effect in an interwoven magnetic kagome metal
• Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr${}_3$Sb${}_5$
• Observation of multiple flat bands and van Hove singularities in the distorted kagome metal NdTi3Bi4
• Observation of unexpected band splitting and magnetically-induced band structure reconstruction in TbTi${}_3$Bi${}_4$
• Synergistic doping and stabilization of magnetically tunable LnTi${}_3$(Sb,Sn)${}_4$ (Ln:Ce--Gd) kagome metals
• Revealing magnetism in the distorted kagome $R$Ti${}_3$Bi${}_4$ ($R$ = Nd, Sm, Gd) via ARPES and XMCD