Nanoscale Conductivity Imaging of Correlated Electronic States in WSe2/WS2 Moiré Superlattices

Abstract

We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe2/WS2 heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one hole per moiré unit cell that persists for temperatures up to 150 K, consistent with other characterization techniques. In addition, we identify for the first time a Mott insulating state at one electron per moiré unit cell. Appreciable inhomogeneity of the correlated states is directly visualized in the hetero-bilayer region, indicative of local disorders in the moiré superlattice potential or electrostatic doping. Our work provides important insights on 2D moiré systems down to the microscopic level.

arXiv comment12 Pages, 4 figures

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• Charge-order-enhanced capacitance in semiconductor moiré superlattices
• Moire Potential, Lattice Relaxation and Layer Polarization in Marginally Twisted MoS2 Bilayers
• Tunable spin and valley excitations of correlated insulators in $\Gamma$-valley moiré bands
• Massive Dirac fermions in moiré superlattices: a route towards topological flat minibands
• Two-dimensional Kagome Materials: Theoretical Insights, Experimental Realizations, and Electronic Structures
• Hofstadter states and reentrant charge order in a semiconductor moiré lattice
• Anisotropic Interlayer Force Field for Group-VI Transition Metal Dichalcogenides
• The strong modulation limit of excitons and trions in moiré materials
• Distinct moiré textures of in-plane electric polarizations for distinguishing moiré origins in homobilayers
• Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer
• Ultra-high-resolution imaging of moiré lattices and superstructures using scanning microwave impedance microscopy under ambient conditions
• Implementing Microwave Impedance Microscopy in a Dilution Refrigerator
• MilliKelvin microwave impedance microscopy in a dry dilution refrigerator
• Phonons of electronic crystals in two-dimensional semiconductor moiré patterns
• Coupled exciton internal and center-of-mass motions in two-dimensional semiconductors by a periodic electrostatic potential
• Melting of electronic and excitonic crystals in 2D semiconductor moiré patterns: a perspective from the Lindemann criterion
• Imaging local discharge cascades for correlated electrons in WS2/WSe2 moiré superlattices
• Realization of independent contacts in barrier-separated InAs/GaSb quantum wells
• Moiré Imaging in Twisted Bilayer Graphene Aligned on Hexagonal Boron Nitride
• Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators
• Electronic phonon-induced magnetism in moiré Mott-Wigner crystals