Semiconductor moiré superlattices have been shown to host a wide array of interaction-driven ground states. However, twisted homobilayers have been difficult to study in the limit of large moiré wavelengths, where interactions are most dominant. In this study, we conducted local electronic compressibility measurements of twisted bilayer WSe (tWSe) at small twist angles. We demonstrated multiple topological bands that host a series of Chern insulators at zero magnetic field near a "magic angle" around 1.23°. Using a locally applied electric field, we induced a topological quantum-phase transition at one hole per moiré unit cell. Our work establishes the topological phase diagram of a generalized Kane-Mele-Hubbard model in tWSe, demonstrating a tunable platform for strongly correlated topological phases.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.adi4728 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effect of Fabricating Process on the Performance of Two-Dimensional p-Type WSe Field Effect Transistors.
Nano Lett
January 2025
Hunan Provincial Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Two-dimensional (2D) transition metal dichalcogenides (TMDs), such as WSe, are promising candidates for next-generation integrated circuits. However, the dependence of intrinsic properties of TMD devices on various processing steps remains largely unexplored. Here, using pristine p-type WSe devices as references, we comprehensively studied the influence of each step in traditional nanofabrication methods on device performance.
View Article and Find Full Text PDFSuperconductivity in 5.0° twisted bilayer WSe.
Nature
January 2025
Department of Physics, Columbia University, New York, NY, USA.
The discovery of superconductivity in twisted bilayer and trilayer graphene has generated tremendous interest. The key feature of these systems is an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Flat bands can also be induced by moiré patterns in lattice-mismatched and/or twisted heterostructures of other two-dimensional materials, such as transition metal dichalcogenides (TMDs).
View Article and Find Full Text PDFMitigating triplet loss in 2D WSe/non-fullerene heterostructures using halogenated acceptors.
Mater Horiz
January 2025
Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24/25, 14476, Germany.
Two-dimensional transition metal dichalcogenides (2D TMDCs) can be combined with organic semiconductors to form hybrid van der Waals heterostructures. Specially, non-fullerene acceptors (NFAs) stand out due to their excellent absorption and exciton diffusion properties. Here, we couple monolayer tungsten diselenide (ML-WSe) with two well performing NFAs, ITIC, and IT-4F (fluorinated ITIC) to achieve hybrid architectures.
View Article and Find Full Text PDFFerroelectricity with concomitant Coulomb screening in van der Waals heterostructures.
Nat Nanotechnol
January 2025
State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China.
Interfacial ferroelectricity emerges in non-centrosymmetric heterostructures consisting of non-polar van der Waals (vdW) layers. Ferroelectricity with concomitant Coulomb screening can switch topological currents or superconductivity and simulate synaptic response. So far, it has only been realized in bilayer graphene moiré superlattices, posing stringent requirements to constituent materials and twist angles.
View Article and Find Full Text PDFControllable Growth of Monolayer and Bilayer WSe by Liquid-Phase Precursor via Chemical Vapor Deposition for Photodetection.
Nanomaterials (Basel)
December 2024
School of Flexible Electronics (Future Technologies), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
Two-dimensional WSe nanosheets have received increasing attention due to their excellent optoelectronic properties. Solid precursors, such as WO and Se powders, have been extensively employed to grow WSe nanosheets by the chemical vapor deposition (CVD) method. However, the high melting point of WO results in heterogeneous nucleation sites and nonuniform growth of the WSe nanosheet.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!