Electronic instabilities of kagome metals: Saddle points and Landau theory

By Ta-Ryeong Park, Mengxing Ye, L. Balents. Physical review B, 2021

211 citations recorded by the source corpus.

We study electronic instabilities of a kagomé metal with a Fermi energy close to saddle points at the hexagonal Brillouin zone face centers. Using parquet renormalization group, we determine the leading and subleading instabilities, finding superconducting, charge, orbital moment, and spin density waves. We then derive and use Landau theory to discuss how different primary density wave orders give rise to charge density wave modulations, as seen in the AV3Sb5 family, with A=K,Rb,Cs. The results provide strong constraints on the mechanism of charge ordering and how it can be further refined from existing and future experiments.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics

View Paper: https://www.semanticscholar.org/paper/2502295d7e954b8caf8e9e994b925fb4c3eba712

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In Atomic and Molecular Physics, and Optics

In Condensed Matter Physics

Citations in the corpus

Quantum states and intertwining phases in kagome materials (2023, background): “The C 2 structural distortion is proposed to arise from a π-phase shift of the CDWs between two adjacent kagome layers 120,124,129,130,132,134,135 .”
Theory of the charge density wave in AV3Sb5 kagome metals (2021, background): “Such a mechanism could be connected, for example, to the van Hove singularities of the in-plane electronic dispersion of the kagome lattice, as found by a recent renormalization group calculation [37].”
Three-state nematicity and magneto-optical Kerr effect in the charge density waves in kagome superconductors (2022, background): “…other macroscopic measurements including photo-emission, x-ray and optical spectroscopy [29, 41–44 As predicted in theoretical works [9, 10, 12, 51–53], the interactions between saddle points in the kagome lattice lead to various competing orders such as real and chiral flux CDW orders…”
Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5 (2021, unknown): “Another anomalous feature of the chiral charge order is that it can carry orbital currents [28,43,44,46], analogous to the fundamental Haldane model [47] and Varma model [48].”