Analysis of Charge Order in the Kagome Metal $A$V${}_3$Sb${}_5$ ($A=$K,Rb,Cs)

Abstract

Motivated by the recent discovery of unconventional charge order, we develop a theory of electronically mediated charge density wave formation in the family of kagome metals $A$V${}_3$Sb${}_5$ ($A=$K,Rb,Cs). The intertwining of van Hove filling and sublattice interference suggests a three-fold charge density wave instability at T${}_{\text{CDW}}$. From there, the charge order forming below T${}_{\text{CDW}}$ can unfold into a variety of phases capable of exhibiting orbital currents and nematicity. We develop a Ginzburg Landau formalism to stake out the parameter space of kagome charge order. We find a nematic chiral charge order to be energetically preferred, which shows tentative agreement with experimental evidence.

5 pages, 3 figures & Supplementary Material

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• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
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• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
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• Charge order breaks time-reversal symmetry in CsV${}_3$Sb${}_5$
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• Discovery of charge order and corresponding edge state in kagome magnet FeGe
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• Encoding innumerable charge density waves of FeGe into polymorphs of LiFe6Ge6
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• Successive orthorhombic distortions in kagome metals by molecular orbital formation
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• Origin of switchable quasiparticle-interference chirality in loop-current phase of kagome metals measured by scanning-tunneling-microscopy
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• Josephson diodes induced by the loop current states
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• Nonequilibrium control of kagome metals
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• Giant Impurity Effects on Charge Loop Current Order States in Kagome Metals
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• Majorana Braiding Racetracks from Charge Chern Insulator - Superconductor Hybrids
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