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arXiv 2609.09611cond-mat.mtrl-scicond-mat.mes-hall

莫尔异质结构中的扭转与应变识别

Twist and strain identification in moiré heterostructures

Zhen Zhan, Federico Escudero, Dong Wang, Yiwen Liu, Ambikesh Gupta, Pierre A. Pantaleón, Francisco Guinea

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中文总结 AI 辅助

本文建立通用框架,利用莫尔图像提取扭转与应变构型,结合最小弹性能和电子谱估计最可能配置,并示例应变三角形莫尔图案的识别。

中文摘要 AI 辅助

莫尔材料的几何和电子性质由于莫尔放大效应,对样品中的扭转和应变高度敏感。因此,准确识别莫尔材料中的扭转和应变至关重要。在这项工作中,我们建立了一个通用框架,用于从具有原子或莫尔尺度分辨率的莫尔图像中提取扭转和应变构型。仅利用莫尔波长信息,我们证明了存在一个连续的可能的扭转和应变构型族,每个构型对应莫尔图案的不同取向。为了估计最可能的扭转-应变构型,我们讨论了涉及最小弹性能和电子谱的额外约束和方法。特别是,最小弹性能反映了随着应变增加,剪切构型变得更加有利。作为所开发方法的一个示例,我们讨论了应变三角形莫尔图案的形成和识别。我们的框架提供了一种全面的方法,用于识别具有莫尔尺度分辨率的系统中的扭转和应变构型。

英文摘要

The geometrical and electronic properties of moiré materials are highly sensitive to the twist and strain in the samples due to the moiré magnifying effect. Accurate identification of twist and strain in moiré materials is therefore essential. In this work, we establish a general framework to extract the twist and strain configurations from moiré images with either atomic or moiré scale resolution. With only moiré-wavelength information, we show that there is a continuous family of possible twist and strain configurations, each one accounting for different orientations of the moiré pattern. To estimate the most likely twist-strain configuration, we discuss additional constraints and methods involving the minimum elastic energy and the electronic spectra. The minimum elastic energy, in particular, reflects that shear configurations become much more favorable as the strain increases. As an example of the developed methodology, we discuss the formation and identification of strained triangular moiré patterns. Our framework provides a comprehensive approach to identify the twist and strain configurations in systems with moiré-scale resolution.

发表机构

  • Wuhan University(武汉大学)
  • Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education(教育部人工微结构和介观物理重点实验室)
  • School of Physics and Technology, Wuhan University(武汉大学物理科学与技术学院)
  • IMDEA Nanoscience(IMDEA纳米科学研究所)
  • Weizmann Institute of Science(魏茨曼科学研究所)
  • Department of Condensed Matter Physics, Weizmann Institute of Science(魏茨曼科学研究所凝聚态物理系)
  • University of Washington(华盛顿大学)
  • Department of Physics, University of Washington(华盛顿大学物理系)
  • Hainan University(海南大学)
  • Center for Theoretical Physics, Hainan University(海南大学理论物理中心)
  • School of Physics and Optoelectronic Engineering, Hainan University(海南大学物理与电子工程学院)
  • Donostia International Physics Center(圣塞巴斯蒂安国际物理中心)

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