Quantum Criticality in Twisted Transition Metal Dichalcogenides

Abstract

In moiré heterostructures, gate-tunable insulating phases driven by electronic correlations have been recently discovered. Here, we use transport measurements to characterize the gate-driven metal-insulator transitions and the metallic phase in twisted WSe${}_2$ near half filling of the first moiré subband. We find that the metal-insulator transition as a function of both density and displacement field is continuous. At the metal-insulator boundary, the resistivity displays strange metal behaviour at low temperature with dissipation comparable to the Planckian limit. Further into the metallic phase, Fermi-liquid behaviour is recovered at low temperature which evolves into a quantum critical fan at intermediate temperatures before eventually reaching an anomalous saturated regime near room temperature. An analysis of the residual resistivity indicates the presence of strong quantum fluctuations in the insulating phase. These results establish twisted WSe${}_2$ as a new platform to study doping and bandwidth controlled metal-insulator quantum phase transitions on the triangular lattice.

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• Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in κ-(ET)_2 Cu_2 (CN)_3
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• Scattering and Pairing in Cuprate Superconductors
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• Band topology, Hubbard model, Heisenberg model, and Dzyaloshinskii-Moriya interaction in twisted bilayer WSe${}_2$
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• Tunable van Hove Singularities and Correlated States in Twisted Trilayer Graphene
• Magnetoresistance near a quantum critical point
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• Density-Dependent Quantum Hall States and Zeeman Splitting in Monolayer and Bilayer WSe${}_2$
• Interaction-Driven Filling-Induced Metal-Insulator Transitions in 2D Moiré Lattices
• Carrier transport theory for twisted bilayer graphene in the metallic regime

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• A Microscopic Perspective on Moiré Materials
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• Mapping twist-tuned multiband topology in bilayer WSe${}_2$
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• Bound on resistivity in flat-band materials due to the quantum metric
• Non-local interactions in moiré Hubbard systems
• Frustrated magnetic interactions in a Wigner-Mott insulator
• Multifaceted moiré superlattice physics in twisted WSe${}_2$ bilayers
• Interaction-driven topological phase diagram of twisted bilayer MoTe${}_2$
• Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers
• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Gate-tunable heavy fermion quantum criticality in a moiré Kondo lattice
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