Chiral symmetry breaking through spontaneous dimerization in kagomé metals

Abstract

Due to an uprise in the variety of candidate compounds, kagome metals have recently gained significant attention. Among other features, kagome metals host Dirac cones as a key band structure feature away from half filling, and potentially yield an exceptionally large fine structure, beyond values found in other 2D Dirac materials such as graphene. We investigate the possibility of chiral symmetry breaking in kagome metals. Based on a heuristic lattice model, we determine the critical coupling strength and the ordering pattern by means of a Schwinger-Dyson mean-field analysis. As the leading instability we identify a dimerization pattern which spontaneously opens an excitation gap at the Dirac point and breaks the chiral symmetry.

References in corpus (26)

• The electronic properties of graphene
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Massive Dirac fermions in a ferromagnetic kagome metal
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Herbertsmithite and the Search for the Quantum Spin Liquid
• Topological insulator on the kagome lattice
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Competing electronic orders on Kagome lattices at van Hove filling
• Chiral flux phase in the Kagome superconductor AV${}_3$Sb${}_5$
• Analysis of Charge Order in the Kagome Metal $A$V${}_3$Sb${}_5$ ($A=$K,Rb,Cs)
• Electronic instabilities of kagome metals: saddle points and Landau theory
• Sublattice Interference in the Kagome Hubbard Model
• Nature of unconventional pairing in the kagome superconductors AV${}_3$Sb${}_5$
• Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in kagome metals ${\text{AV}}_3{\text{Sb}}_5$
• Theoretical prediction of a strongly correlated Dirac metal
• Quantum critical point in graphene approached in the limit of infinitely strong Coulomb interaction
• Monte-Carlo study of the semimetal-insulator phase transition in monolayer graphene with realistic inter-electron interaction potential
• Excitonic instability in two-dimensional degenerate semimetals
• Gap generation and semimetal-insulator phase transition in graphene
• Massive Dirac fermions in single-layer graphene
• Absence of dynamical gap generation in suspended graphene
• Stability of Dirac Liquids with Strong Coulomb Interaction
• Turbulent hydrodynamics in strongly correlated Kagome metals
• Molecular Beam Epitaxy Growth of Antiferromagnetic Kagome Metal FeSn
• Dynamical gap generation in graphene with frequency dependent renormalization effects
• Bond order wave instabilities in doped frustrated antiferromagnets: "Valence bond solids" at fractional filling

Cited by in corpus (3)

• Van Hove tuning of AV3Sb5 kagome metals under pressure and strain
• Designing Topological High-Order Van Hove Singularities: Twisted Bilayer Kagomé
• Classification of mass terms in kagome semimetals