Atomic reconstruction has been widely observed in two-dimensional van der Waals structures with small twist angles^{1,2,3,4,5,6,7}. This unusual behaviour leads to many novel phenomena, including strong electronic correlation, spontaneous ferromagnetism and topologically protected states^{1,5,8,9,10,11,12,13,14}. Nevertheless, atomic reconstruction typically occurs spontaneously, exhibiting only one single stable state. Using conductive atomic force microscopy, here we show that, for small-angle twisted monolayer–multilayer graphene, there exist two metastable reconstruction states with distinct stacking orders and strain soliton structures. More importantly, we demonstrate that these two reconstruction states can be reversibly switched, and the switching can propagate spontaneously in an unusual domino-like fashion. Assisted by lattice-resolved conductive atomic force microscopy imaging and atomistic simulations, the detailed structure of the strain soliton networks has been identified and the associated propagation mechanism is attributed to the strong mechanical coupling among solitons. The fine structure of the bistable states is critical for understanding the unique properties of van der Waals structures with tiny twists, and the switching mechanism offers a viable means for manipulating their stacking states.

^{在具有小扭转角1,2,3,4,5,6,7}的二维范德华结构中已广泛观察到原子重建。这种不寻常的行为导致了许多新现象，包括强电子相关性、自发铁磁性和拓扑保护状态^{1、5、8、9、10、11、12、13、14}. 然而，原子重建通​​常是自发发生的，仅表现出一个单一的稳定状态。使用导电原子力显微镜，我们在这里表明，对于小角度扭曲的单层 - 多层石墨烯，存在两种具有不同堆叠顺序和应变孤子结构的亚稳态重建状态。更重要的是，我们证明了这两种重建状态可以可逆地切换，并且这种切换可以以一种不寻常的多米诺骨牌方式自发传播。在晶格分辨的导电原子力显微镜成像和原子模拟的帮助下，已经确定了应变孤子网络的详细结构，并且相关的传播机制归因于孤子之间的强机械耦合。