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Interaction effects and superconductivity signatures in twisted double-bilayer WSe2

DOI: 10.1039/D0NH00248H DOI Help

Authors: Liheng An (Hong Kong University of Science and Technology) , Xiangbin Cai (Hong Kong University of Science and Technology) , Ding Pei (University of Oxford) , Meizhen Huang (Hong Kong University of Science and Technology) , Zefei Wu (Hong Kong University of Science and Technology) , Zishu Zhou (Hong Kong University of Science and Technology) , Jiangxiazi Lin (Hong Kong University of Science and Technology) , Zhehan Ying (Hong Kong University of Science and Technology) , Ziqing Ye (Hong Kong University of Science and Technology) , Xuemeng Feng (Hong Kong University of Science and Technology) , Ruiyan Gao (Hong Kong University of Science and Technology) , Cephise Cacho (Diamond Light Source) , Matthew Watson (Diamond Light Source) , Yulin Chen (University of Oxford) , Ning Wang (Hong Kong University of Science and Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanoscale Horizons , VOL 556

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 24366

Abstract: Twisted bilayer graphene provides a new two-dimensional platform for studying electron interaction phenomena and flat band properties such as correlated insulator transition, superconductivity and ferromagnetism at certain magic angles. Here, we present experimental characterization of interaction effects and superconductivity signatures in p-type twisted double-bilayer WSe2. Enhanced interlayer interactions are observed when the twist angle decreases to a few degrees as reflected by the high-order satellites in the electron diffraction patterns taken from the reconstructed domains from a conventional moiré superlattice. In contrast to twisted bilayer graphene, there is no specific magic angle for twisted WSe2. Flat band properties are observable at twist angles ranging from 1 to 4 degrees. Our work has facilitated future study in the area of flat band related properties in twisted transition metal dichalcogenide layered structures.

Subject Areas: Physics, Materials


Instruments: I05-ARPES