Gate-tunable heavy fermion quantum criticality in a moiré Kondo lattice

Abstract

We propose a realization of Kondo-lattice physics in moiré superlattices at the interface between a WX${}_2$ homobilayer and MoX${}_2$ monolayer (where X=S,Se). Under appropriate gating conditions, the interface-WX${}_2$-layer forms a triangular lattice of local moments that couple to itinerant electrons in the other WX${}_2$-layer via a gate-tunable Kondo exchange interaction. Using a parton mean-field approach we identify a range of twist-angles which support a gate-tuned quantum phase transition between a heavy-fermion liquid with large anomalous Hall conductance and a fractionalized chiral spin-liquid coexisting with a light Fermi liquid, and describe experimental signatures to distinguish among competing theoretical scenarios.

4+7 pages, 2+5 figures

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• Quantum Criticality in Heavy Fermion Metals
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
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• Theory of a continuous Mott transition in two dimensions
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• Topological Kondo semimetals emulated in hetero-bilayer transition metal dichalcogenides
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