Correlated Topological Mixed-Valence Insulators in Moiré Hetero-Bilayers

Abstract

Moiré transition metal dichalcogenide (TMD) materials provide an ideal playground for studying the combined interplay of strong interactions and band-topology over a range of electronic fillings. Here we investigate the panoply of interaction-induced electronic phases that arise at a total commensurate filling of ${\nu }_T=2$ in moiré TMD heterobilayers, focusing specifically on their renormalized band-topology. We carry out a comprehensive self-consistent parton mean-field analysis on an interacting mixed-valence Hamiltonian describing AB-stacked MoTe${}_2$/WSe${}_2$ to highlight different ingredients that arise due to "Mottness", band-flattening, an enhanced excitonic tendency, and band-inversion, leading to correlated topological semi-metals and insulators. We also propose a possible route towards realizing fractionalized insulators with emergent neutral fermionic excitations in this and other closely related platforms.

Main text: 7 pages, 3 figures, Supplementary information: 3 pages

References in corpus (28)

• Signatures of Fractional Quantum Anomalous Hall States in Twisted MoTe2 Bilayer
• Observation of Fractionally Quantized Anomalous Hall Effect
• Quantum anomalous Hall effect from intertwined moiré bands
• Integer and fractional Chern insulators in twisted bilayer MoTe2
• Observation of integer and fractional quantum anomalous Hall effects in twisted bilayer MoTe2
• Correlated Topological Insulators with Mixed Valence
• Continuous Mott transition in semiconductor moiré superlattices
• Quantum Criticality in Twisted Transition Metal Dichalcogenides
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Quantum Oscillations of Electrical Resistivity in an Insulator
• Gate-tunable heavy fermions in a moiré Kondo lattice
• Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB${}_6$
• Excitons in topological Kondo insulators - theory of thermodynamic and transport anomalies in SmB${}_6$
• Valley-Polarized Quantum Anomalous Hall State in Moiré MoTe${}_2$/WSe${}_2$ Heterobilayers
• Topological Phases in AB-Stacked MoTe${}_2$/WSe${}_2$: ${\mathbb{Z}}_2$ Topological Insulators, Chern Insulators, and Topological Charge Density Waves
• Spin-Orbit Coupling in Transition Metal Dichalcogenide Heterobilayer Flat Bands
• Quantum anomalous Hall effect from inverted charge transfer gap
• Self-consistent slave rotor mean field theory for strongly correlated systems
• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Failure of Topological Invariants in Strongly Correlated Matter
• Majoranas in mixed-valence insulators
• Massive Dirac fermions in moiré superlattices: a route towards topological flat minibands
• Nematic excitonic insulator in transition metal dichalcogenide moiré heterobilayers
• Excitonic Chern insulator and kinetic ferromagnetism in MoTe${}_2$/WSe${}_2$ moiré bilayer
• Quantum anomalous Hall effect and electric-field-induced topological phase transition in AB-stacked MoTe${}_2$/WSe${}_2$ moiré heterobilayers
• Quantum Oscillations in the Magnetisation and Density of States of Insulators
• Kondo effect and its destruction in hetero-bilayer transition metal dichalcogenides
• Topological surface states in the Kondo insulator YbB${}_{12}$ revealed via planar tunneling spectroscopy

Cited by in corpus (7)

• Theory of Correlated Insulators and Superconductor at $\nu =1$ in Twisted WSe${}_2$
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• 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
• Mott transition and correlation effects on strictly localized states in an octagonal quasicrystal
• Higher Chern bands in helical homotrilayer transition metal dichalcogenides
• SU(4) Kondo Lattice in Semiconductor Moiré Materials