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  • High-order superlattices by...
    Zhao, Bei; Wan, Zhong; Liu, Yuan; Xu, Junqing; Yang, Xiangdong; Shen, Dingyi; Zhang, Zucheng; Guo, Chunhao; Qian, Qi; Li, Jia; Wu, Ruixia; Lin, Zhaoyang; Yan, Xingxu; Li, Bailing; Zhang, Zhengwei; Ma, Huifang; Li, Bo; Chen, Xiao; Qiao, Yi; Shakir, Imran; Almutairi, Zeyad; Wei, Fei; Zhang, Yue; Pan, Xiaoqing; Huang, Yu; Ping, Yuan; Duan, Xidong; Duan, Xiangfeng

    Nature (London), 03/2021, Letnik: 591, Številka: 7850
    Journal Article

    Two-dimensional (2D) materials and the associated van der Waals (vdW) heterostructures have provided great flexibility for integrating distinct atomic layers beyond the traditional limits of lattice-matching requirements, through layer-by-layer mechanical restacking or sequential synthesis. However, the 2D vdW heterostructures explored so far have been usually limited to relatively simple heterostructures with a small number of blocks . The preparation of high-order vdW superlattices with larger number of alternating units is exponentially more difficult, owing to the limited yield and material damage associated with each sequential restacking or synthesis step . Here we report a straightforward approach to realizing high-order vdW superlattices by rolling up vdW heterostructures. We show that a capillary-force-driven rolling-up process can be used to delaminate synthetic SnS /WSe vdW heterostructures from the growth substrate and produce SnS /WSe roll-ups with alternating monolayers of WSe and SnS , thus forming high-order SnS /WSe vdW superlattices. The formation of these superlattices modulates the electronic band structure and the dimensionality, resulting in a transition of the transport characteristics from semiconducting to metallic, from 2D to one-dimensional (1D), with an angle-dependent linear magnetoresistance. This strategy can be extended to create diverse 2D/2D vdW superlattices, more complex 2D/2D/2D vdW superlattices, and beyond-2D materials, including three-dimensional (3D) thin-film materials and 1D nanowires, to generate mixed-dimensional vdW superlattices, such as 3D/2D, 3D/2D/2D, 1D/2D and 1D/3D/2D vdW superlattices. This study demonstrates a general approach to producing high-order vdW superlattices with widely variable material compositions, dimensions, chirality and topology, and defines a rich material platform for both fundamental studies and technological applications.