Gate-tunable heavy fermions in a moiré Kondo lattice

Abstract

The Kondo lattice, describing a matrix of local magnetic moments coupled via spin-exchange interactions to itinerant conduction electrons, is a prototype of strongly correlated quantum matter. Traditionally, Kondo lattices are realized in intermetallic compounds containing lanthanide or actinide. The complex electronic structure and limited tunability of both the electron density and exchange interactions in these bulk materials pose significant challenges to study Kondo lattice physics. Here, we report the realization of a synthetic Kondo lattice in AB-stacked MoTe2/WSe2 moiré bilayers, where the MoTe2 layer is tuned to a Mott insulating state, supporting a triangular moiré lattice of local moments, and the WSe2 layer is doped with itinerant conduction carriers. We observe heavy fermions with a large Fermi surface below the Kondo temperature. We also observe destruction of the heavy fermions by an external magnetic field with an abrupt decrease of the Fermi surface size and quasiparticle mass. We further demonstrate widely and continuously gate-tunable Kondo temperatures through either the itinerant carrier density or Kondo interaction. Our study opens the possibility of in-situ access to the rich phase diagram of the Kondo lattice with exotic quantum criticalities in a single device based on semiconductor moiré materials

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• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Topological superconductivity in doped magnetic moiré semiconductors
• Progress and Prospects in Two-Dimensional Magnetism of van der Waals Materials
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• Coupled topological flat and wide bands: Quasiparticle formation and destruction
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• Emergent flat band and topological Kondo semimetal driven by orbital-selective correlations
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• Strong-coupling phases of trions and excitons in electron-hole bilayers at commensurate densities
• Long-lived Topological Flatband Excitons in Semiconductor Moiré Heterostructures: a Bosonic Kane-Mele Model Platform
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• Probing the phase transition to a coherent 2D Kondo lattice
• Is attention all you need to solve the correlated electron problem?
• Theory of intervalley-coherent AFM order and topological superconductivity in tWSe${}_2$
• Topological Kondo semimetal and insulator in AB-stacked heterobilayer transition metal dichalcogenides
• Nature of the unconventional heavy fermion Kondo state in monolayer CeSiI
• A New Moiré Platform Based on M-Point Twisting
• Majorana zero modes in twisted transition metal dichalcogenides homobilayers
• Spin-polarons and ferromagnetism in doped dilute Wigner-Mott insulators
• Nematic metal in a multi-valley electron gas: Variational Monte Carlo analysis and application to AlAs
• Topological Chiral Superconductivity Mediated by Intervalley Antiferromagnetic Fluctuations in Twisted Bilayer WSe${}_2$
• A microscopic Kondo lattice model for the heavy fermion antiferromagnet CeIn${}_3$
• Pick-up and assembling of chemically sensitive van der Waals heterostructures using dry cryogenic exfoliation
• Optical readout of the chemical potential of two-dimensional electrons
• Correlated Topological Mixed-Valence Insulators in Moiré Hetero-Bilayers
• Dynamic mass generation and topological order in overscreened Kondo lattices
• Pressure-tuned many-body phases through $\Gamma$-K valleytronics in moiré bilayer WSe${}_2$
• Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu${}_2$
• Exciton and light induced ferromagnetism from doping a moiré Mott insulator
• Apparent Kondo effect in Moiré TMD bilayers: Heavy fermions or disorder?
• Multicomponent magneto-orbital order and magneto-orbitons in monolayer VCl3
• Ferromagnetic semimetal and charge-density wave phases of interacting electrons in a honeycomb moiré potential
• Marginal Fermi liquid at magnetic quantum criticality from dimensional confinement
• Double exchange, itinerant ferromagnetism and topological Hall effect in moiré heterobilayer
• Correlated states in super-moiré materials with a kernel polynomial quantics tensor cross interpolation algorithm
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• $T-$linear resistivity from magneto-elastic scattering: application to PdCrO${}_2$
• Itinerant topological magnons and spin excitons in twisted transition metal dichalcogenides: Mapping electron topology to spin counterpart
• Observation of Resonance of Kagome Flat Band Doublet
• Oscillate and Renormalize: Fast Phonons Reshape the Kondo Effect in Flat Band Systems
• Magnetic Moiré Systems: a review
• Topological Kondo semimetals emulated in hetero-bilayer transition metal dichalcogenides
• Interplay between topology and electron-electron interactions in the moiré MoTe${}_2$/WSe${}_2$ heterobilayer
• Self-consistent tensor network method for correlated super-moiré matter beyond one billion sites
• Flat-Band Driven Kondo Breakdown and Reentrant Effects in Heavy-Fermion Moiré Superlattices
• Dichotomy of flat bands in the van der Waals ferromagnet Fe${}_5$GeTe${}_2$
• Heavy fermion phase diagram in magic-angle twisted trilayer graphene
• Emergent Chiral Metal near a Kondo Breakdown Quantum Phase Transition
• Mott-Derived Local Moments and Kondo Hybridization in a d-electron Kagome lattice
• Doping-induced Quantum Anomalous Hall Crystals and Topological Domain Walls
• Unconventional superconductivity mediated by exciton density wave fluctuations
• Selective Kondo screening and strange metallicity by sliding Dirac semimetals
• Higher Chern bands in helical homotrilayer transition metal dichalcogenides
• Concealed Mott Criticality: Unifying the Kondo Breakdown and Doped Charge-Transfer Insulators
• Particle-hole Symmetric Slave Boson Method for the Mixed Valence Problem
• SU(4) Kondo Lattice in Semiconductor Moiré Materials
• Stripe antiferromagnetism and chiral superconductivity in tWSe${}_2$