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arXiv 2510.13699cond-mat.mtrl-sci
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无扭转二维材料中的应变诱导莫尔重构与记忆效应

Strain-induced Moiré Reconstruction and Memorization in Two-Dimensional Materials without Twist

Nazmul Hasan, Tara Peña, Aditya Dey, Dongyoung Yoon, Zakaria Islam, Yue Zhang, Maria Vitoria Guimaraes Leal, Arend M. van der Zande, Hesam Askari, Stephen M. Wu

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AI总结：

提出一种通过受控异质应变在无扭转二维材料中产生莫尔干涉的新方法，实现高良率、可记忆的莫尔周期与对称性调控，突破传统扭转堆叠的制备瓶颈。

摘要：

具有层间扭转的二维（2D）材料会表现出一种莫尔干涉图案，其周期大于任何组成层单胞的周期。在这些系统中，出现了大量由依赖于莫尔的多体电子关联效应或非平凡能带拓扑所导致的奇异相。利用扭转产生莫尔干涉的一个问题在于，由于通过使用粘弹性印章的机械堆叠进行制备，难以制造高质量、均匀且可重复的样品。在这里，我们展示了一种新方法，通过在无扭转的二维材料上受控施加逐层应变（异质应变）来产生莫尔干涉，其中莫尔干涉源于应变诱导的晶格失配，而无需扭转或堆叠。异质应变的产生是通过将受应力的薄膜沉积到二维材料上，对顶层施加大的应变，同时使更下层的应变较小。我们通过改变应力膜力（膜厚×膜应力）和几何形状，在无扭转的二维多层和双层中实现了莫尔周期性和对称性的确定性控制，良率达97%。在移除应力层后，莫尔重构效应被记忆下来。对应变自由度的控制为一系列完全未被探索的、可实现的可调莫尔几何对称性打开了大门，这些对称性现在可以在高良率且不依赖用户技能的过程中实现，仅需数小时。该技术解决了新型莫尔量子材料发现中长期存在的吞吐量瓶颈，并为基于二维莫尔的电子或光学器件的工业兼容制造打开了大门。

英文摘要：

Two-dimensional (2D) materials with a twist between layers exhibit a moiré interference pattern with larger periodicity than any of the constituent layer unit cells. In these systems, a wealth of exotic phases appear that result from moiré-dependent many-body electron correlation effects or non-trivial band topology. One problem with using twist to generate moiré interference has been the difficulty in creating high-quality, uniform, and repeatable samples due to fabrication through mechanical stacking with viscoelastic stamps. Here we show, a new method to generate moiré interference through the controlled application of layer-by-layer strain (heterostrain) on non-twisted 2D materials, where moiré interference results from strain-induced lattice mismatch without twisting or stacking. Heterostrain generation is achieved by depositing stressed thin films onto 2D materials to apply large strains to the top layers while leaving layers further down less strained. We achieve deterministic control of moiré periodicity and symmetry in non-twisted 2D multilayers and bilayers, with 97% yield, through varying stressor film force (film thickness X film stress) and geometry. Moiré reconstruction effects are memorized after the removal of the stressor layers. Control over the strain degree-of-freedom opens the door to a completely unexplored set of unrealized tunable moiré geometric symmetries, which may now be achieved in a high-yield and user-skill independent process taking only hours. This technique solves a long-standing throughput bottleneck in new moiré quantum materials discovery and opens the door to industrially-compatible manufacturing for 2D moiré-based electronic or optical devices.

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