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Strange metals arise in a variety of platforms for strongly correlatedelectrons, ranging from the cuprates, heavy fermions to flat band systems.Motivated by recent experiments in kagome metals, we study a Hubbard model on akagome lattice whose noninteracting limit contains flat bands. A Kondo latticedescription is constructed, in which the degrees of freedom are exponentiallylocalized molecular orbitals. We identify an orbital-selective Mott transitionthrough an extended dynamical mean field theory of the effective model. Thetransition describes a quantum critical point at which quasiparticles are lostand strange metallicity emerges. Our theoretical work opens up a new route forrealizing beyond-Landau quantum criticality and emergent quantum phases that itnucleates.

Metallic quantum criticality enabled by flat bands in a kagome lattice