Analysis of Charge Order in the Kagome MetalAV3Sb5(A=K,Rb,Cs),Physical Review Letters

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Analysis of Charge Order in the Kagome MetalAV3Sb5(A=K,Rb,Cs)
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-11-19 , DOI: 10.1103/physrevlett.127.217601
M Michael Denner ₁ , Ronny Thomale _{2,

3} , Titus Neupert ₁

Affiliation

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_{CDW}

. From there, the charge order forming below

T_{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.

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