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Marginally twisted WS bilayers undergo lattice reconstructions, but it is unclear if the distortion is equally distributed or confined to specific sublayers. Here, we use combined noncontact atomic force microscopy with scanning tunneling spectroscopy to tune the probing depth to extract electronic and atomic lattice information for each sublayer separately. We find a lattice reconstruction unexpectedly confined to the WS layer in contact with graphite only, governed by transition metal dichalcogenide-substrate interactions, leading to a peculiar type of a ferroelectric domain wall.
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http://dx.doi.org/10.1021/acsnano.5c01308 | DOI Listing |
ACS Nano
September 2025
Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
As a versatile platform for exploring exotic quantum phases, moiré superlattices, ranging from twisted graphene to twisted transition metal dichalcogenides, have been intensively studied. In this work, based on exact diagonalization and Hartree-Fock mean-field calculations, the interaction-driven topological phases are investigated in hole-doped twisted bilayer MoS at the high filling factor = 3. Besides the nematic insulator and quantum anomalous Hall phases, the topological Wigner molecule crystal (TWMC) phase is found in the phase diagram.
View Article and Find Full Text PDFPhys Rev Lett
August 2025
Southeast University, Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Nanjing 21189, China.
Twisting layers provide a rich ore for exotic physics in low dimensions. Despite the abundant discoveries of twistronics from the aspect of electronic structures, ferroic moiré textures are more plain and thus less concerned. Rigid lattice models are straightforward which can give a rough but intuitional description in most cases.
View Article and Find Full Text PDFAdv Sci (Weinh)
August 2025
Key Laboratory of Multiscale Spin Physics, Ministry of Education, School of Physics and Astronomy, Beijing Normal University, Beijing, 100875, P. R. China.
The moiré superlattices have garnered significant attention due to their unique twist-angle-dependent electronic and optical properties. Creating high-quality twisted bilayer structures stands as one of the major frontiers in the study of correlated moiré physical properties, however, which remains a challenge. Here, a cyclical-carrier-gas chemical vapor deposition method is employed to grow high-quality twisted bilayers MoS.
View Article and Find Full Text PDFAdv Mater
August 2025
CIC nanoGUNE, BRTA, Donostia-San Sebastian, Basque Country, 20018, Spain.
Achieving synaptic functionality electronically in a single-element quantum material is a fundamental challenge, as conventional methods rely on the introduction of extrinsic charge-traps or polar components. Here, it is demonstrated that twisted double bilayer graphene (tDBLG) moiré superlattices-composed purely of carbon-exhibit electronic hysteresis and plasticity in presence of twist-angle disorder. Inversion symmetry breaking at the moiré length scales also gives rise to second-order nonlinear electrical response via disorder-mediated extrinsic mechanisms.
View Article and Find Full Text PDFNat Commun
August 2025
Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea.
The discovery of quasicrystals, characterized by unique, non-repeating atomic arrangements and forbidden rotational symmetries, has significantly expanded our understanding of structural order in materials. However, precise control over quasiperiodic length scales remains challenging due to the inherent constraints of atomic arrangements and chemical compositions. In this study, we utilized metal-organic frameworks (MOFs) as a designable platform to generate moiré patterns including dodecagonal quasiperiodic symmetry through the projection of twisted bilayer structures.
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