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Strain engineering of 2D semiconductors and graphene: from strain fields to band-structure tuning and photonic applications
Light: Science & Applications ( IF 19.4 ) Pub Date : 2020-11-23 , DOI: 10.1038/s41377-020-00421-5
Zhiwei Peng , Xiaolin Chen , Yulong Fan , David J. Srolovitz , Dangyuan Lei

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) and graphene compose a new family of crystalline materials with atomic thicknesses and exotic mechanical, electronic, and optical properties. Due to their inherent exceptional mechanical flexibility and strength, these 2D materials provide an ideal platform for strain engineering, enabling versatile modulation and significant enhancement of their optical properties. For instance, recent theoretical and experimental investigations have demonstrated flexible control over their electronic states via application of external strains, such as uniaxial strain and biaxial strain. Meanwhile, many nondestructive optical measurement methods, typically including absorption, reflectance, photoluminescence, and Raman spectroscopies, can be readily exploited to quantitatively determine strain-engineered optical properties. This review begins with an introduction to the macroscopic theory of crystal elasticity and microscopic effective low-energy Hamiltonians coupled with strain fields, and then summarizes recent advances in strain-induced optical responses of 2D TMDCs and graphene, followed by the strain engineering techniques. It concludes with exciting applications associated with strained 2D materials, discussions on existing open questions, and an outlook on this intriguing emerging field.



中文翻译:

二维半导体和石墨烯的应变工程:从应变场到能带结构调谐和光子应用

二维(2D)过渡金属二硫化碳(TMDC)和石墨烯构成了一系列新的晶体材料,这些材料具有原子厚度和奇异的机械,电子和光学特性。由于其固有的卓越机械柔韧性和强度,这些2D材料为应变工程提供了理想的平台,从而实现了多种调制方式并显着增强了其光学性能。例如,最近的理论和实验研究表明,可以通过施加外部应变(例如单轴应变和双轴应变)来灵活控制其电子状态。同时,许多非破坏性光学测量方法,通常包括吸收,反射率,光致发光和拉曼光谱,可以很容易地利用它来定量确定应变设计的光学性质。这篇综述首先介绍了晶体弹性的宏观理论,微观有效低能哈密顿量以及应变场,然后总结了二维TMDC和石墨烯在应变诱导的光学响应方面的最新进展,以及应变工程技术。它以与紧张的2D材料相关的令人兴奋的应用程序,对现有开放性问题的讨论以及对这个有趣的新兴领域的展望作为结尾。其次是应变工程技术。它以与紧张的2D材料相关的令人兴奋的应用程序,对现有开放性问题的讨论以及对这个有趣的新兴领域的展望作为结尾。其次是应变工程技术。它以与紧张的2D材料相关的令人兴奋的应用程序,对现有开放性问题的讨论以及对这个有趣的新兴领域的展望作为结尾。

更新日期:2020-11-23
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