Van-Hove annihilation and nematic instability on a Kagome lattice

Abstract

Novel states of matter arise in quantum materials due to strong interactions among electrons. A nematic phase breaks the point group symmetry of the crystal lattice and is known to emerge in correlated materials. Here we report the observation of an intra-unit-cell nematic order and signatures of Pomeranchuk instability in the Kagome metal ScV6Sn6. Using scanning tunneling microscopy and spectroscopy, we reveal a stripe-like nematic order breaking the crystal rotational symmetry within the Kagome lattice itself. Moreover, we identify a set of van Hove singularities adhering to the Kagome layer electrons, which appear along one direction of the Brillouin zone while being annihilated along other high-symmetry directions, revealing a rotational symmetry breaking. Via detailed spectroscopic maps, we further observe an elliptical deformation of Fermi surface, which provides direct evidence for an electronically mediated nematic order. Our work not only bridges the gap between electronic nematicity and Kagome physics, but also sheds light on the potential mechanism for realizing symmetry-broken phases in correlated electron systems.

19 pages, 5 figures

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Cited by in corpus (13)

• Kagome metals
• Revealing the orbital origins of exotic electronic states with Ti substitution in kagome superconductor CsV3Sb5
• Perspective: imaging atomic step geometry to determine surface terminations of kagome materials and beyond
• Higher-Order Van Hove Singularities in Kagome Topological Bands
• High-order van Hove singularities and nematic instability in the kagome superconductor CsTi${}_3$Bi${}_5$
• 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
• Multiple topological corner states in the continuum of extended kagome lattice
• Magnetism of kagome metals $\left({\text{Fe}}_{1-x}{\text{Co}}_x\right)\text{Sn}$ studied by $\mu$SR
• Magnetic-field effect on excitonic condensation emergent in extended Falicov-Kimball model
• Beyond kagome: $p$-bands in kagome metals
• Kekulé order from diffuse nesting near higher-order Van Hove points
• Theory of unconventional magnetism in a Cu-based kagome metal