Moiré materials with superlattice periodicity many times the atomic length scale have shown strong electronic correlations and band topology with unprecedented tunability. Non-volatile control of the moiré potentials could allow on-demand switching of superlattice effects but has remained challenging to achieve. Here we demonstrate the switching of the correlated and moiré band insulating states, and the associated nonlinear anomalous Hall effect, by the ferroelectric effect. This is achieved in a ferroelectric WTe₂ bilayer of the T_d structure with a centred-rectangular moiré superlattice induced by interfacing with a WSe₂ monolayer of the H structure. The results can be understood in terms of polarization-dependent charge transfer between two WTe₂ monolayers, in which the interfacial layer has a much stronger moiré potential depth; ferroelectric switching thus turns on and off the moiré insulating states. Our study demonstrates the potential for creating new functional moiré materials by incorporating intrinsic symmetry-breaking orders.

具有超晶格周期性数倍于原子长度尺度的莫尔材料显示出强大的电子相关性和带拓扑结构以及前所未有的可调性。对莫尔势的非易失性控制可以实现超晶格效应的按需切换，但实现起来仍然具有挑战性。在这里，我们通过铁电效应演示了相关带和莫尔带绝缘态的切换，以及相关的非线性反常霍尔效应。这是在T _d结构的铁电 WTe ₂双层中实现的，该双层具有通过与H 结构的WSe _{2单层界面产生的中心矩形莫尔超晶格。结果可以用两个WTe 2}单层之间的偏振相关电荷转移来理解，其中界面层具有更强的莫尔势深度；铁电开关因此打开和关闭莫尔绝缘状态。我们的研究证明了通过结合固有的对称破缺顺序来创造新的功能性莫尔材料的潜力。