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In this work, we theoretically study the charge order and orbital magneticproperties of a new type of antiferromagnetic kagome metal FeGe. Based on firstprinciples density functional theory (DFT) calculations, we have studied theelectronic structures, Fermi-surface quantum fluctuations, as well as phononproperties of the antiferromagnetic kagome metal FeGe. We find that chargedensity wave emerges in such a system due to a subtle cooperation betweenelectron-electron ($e$-$e$) interactions and electron-phonon couplings, whichgives rise to an unusual scenario of interaction-triggered phononinstabilities, and eventually yields a charge density wave (CDW) state. Wefurther show that, in the CDW phase, the ground-state current densitydistribution exhibits an intriguing star-of-David pattern, leading to fluxdensity modulation. The orbital fluxes (or current loops) in this systememerges as a result of the subtle interplay between magnetism, latticegeometries, charge order, and spin-orbit coupling (SOC), which can be describedby a simple, yet universal, tight-binding theory including a Kane-Mele type SOCterm and a magnetic exchange interaction. We further study the origin of thepeculiar step-edge states in FeGe, which shed light on the topologicalproperties and correlation effects in this new type of kagome antiferromagneticmaterial.

Theory for charge density wave and orbital-flux state in antiferromagnetic kagome metal FeGe