论文标题
铁电WTE2/WSE2超级晶格中的可切换Moiré电位
Switchable moiré potentials in ferroelectric WTe2/WSe2 superlattices
论文作者
论文摘要
具有超级晶格周期性的Moiré材料是原子长度尺度的多倍，已使强大的电子相关性和带有前所未有的可调性研究。但是，迄今为止尚未实现对摩尔电势的非易失性控制，这可以允许超晶格效应的按需切换。在这里，我们证明了相关和moiré带绝缘状态的切换以及通过铁电作用的相关非线性异常霍尔效应。这是在TD结构的铁电WTE2双层中实现的，该双层具有与H结构的WSE2单层接口引起的中心矩形Moiré超晶格。可以从两个WTE2单层之间的极化依赖电荷转移来理解结果，这些WTE2单层具有截然不同的潜在深度。铁电开关因此打开/关闭超晶格。我们的研究表明，通过结合固有的对称性订单来创建新的功能性Moiré材料的潜力。
Moiré materials, with superlattice periodicity many times the atomic length scale, have enabled the studies of strong electronic correlations and band topology with unprecedented tunability. However, nonvolatile control of the moiré potentials, which could allow on-demand switching of the superlattice effects, has not been achieved to date. 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 Td structure with a centered-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, which possess very different moiré potential depths; ferroelectric switching thus turns on/off the superlattice. Our study demonstrates the potential of creating new functional moiré materials by incorporating intrinsic symmetry-breaking orders.
