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Metallic quantum criticality enabled by flat bands in a kagome lattice
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Strange metals arise in a variety of platforms for strongly correlated electrons, ranging from the cuprates, heavy fermions to flat band systems. Motivated by recent experiments in kagome metals, we study a Hubbard model on a kagome lattice whose noninteracting limit contains flat bands. A Kondo lattice description is constructed, in which the correlation effects are captured by symmetry preserving and exponentially localized molecular orbitals. These compact molecular orbitals represent the local degrees of freedom that emerge from topological flat bands. We identify a quantum critical point at which quasiparticles are lost and strange metallicity emerges. Our theoretical work opens up a new route for realizing beyond-Landau quantum criticality, as well as the associated strange metallicity and emergent quantum phases.
Forward citations
Cited by 4 Pith papers
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Observation of Resonance of Kagome Flat Band Doublet
In CsCr6Sb6, cooling to ~72 K makes flat and dispersive kagome bands hybridize—a flat band resonance—simultaneously with the onset of short-range antiferromagnetism.
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In narrow-band Hubbard models, quantum geometry drives ferromagnetism and band dispersion drives antiferromagnetism, with the transition set by a competition between the quantum metric and a dispersion scale.
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Quantum Fisher information in a strange metal
QFI increases scale-free as the strange metal forms at a Kondo destruction QCP, shown by neutron scattering away from Bragg peaks and QMC simulations.
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The top two moiré valence bands of twisted WSe2, computed from first principles, carry Chern number C=+1 each and decompose into a compact f-orbital plus a topological c-orbital, giving ab initio parameters for effect...
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