Excitons in two-dimensional materials and heterostructures: Optical and magneto-optical properties

IF 4.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mikhail Glazov, Ashish Arora, Andrey Chaves, Yara Galvão Gobato
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引用次数: 0

Abstract

Two-dimensional (2D) materials are attractive systems to explore exciton physics and possible applications in optoelectronics, opto-spintronics, and quantum technologies. Monolayer transition-metal dichalcogenides (TMDs) are direct gap 2D semiconductor materials with robust excitons and two inequivalent K+ and K valleys. They can be vertically stacked to form van der Waals (vdW) heterostructures with typically Type II band alignment that enables the formation of interlayer excitons (IEs) and creates Moiré patterns. Magnetic 2D materials are also promising systems to explore exciton physics and their correlations with magnetic properties. They can be stacked with TMD materials to form magnetic vdW heterostructures. Their optical properties are strongly dependent on the number of layers, charge transfer, defects, strain, and twist angle stacking, which offer a versatile platform to control their physical properties. Here, we review some recent discoveries on the exciton and valley properties of van der Waals materials and heterostructures.

Graphical abstract

Abstract Image

二维材料和异质结构中的激子:光学和磁光特性
二维(2D)材料是探索激子物理学以及光电子学、光自旋电子学和量子技术中可能应用的极具吸引力的系统。单层过渡金属二掺杂物(TMDs)是直接间隙二维半导体材料,具有强大的激子和两个不等价的 K+ 和 K- 谷。它们可以垂直堆叠形成范德华(vdW)异质结构,具有典型的 II 型带排列,能够形成层间激子(IE)并产生莫伊里纹。磁性二维材料也是探索激子物理及其与磁性相关性的理想系统。它们可以与 TMD 材料堆叠形成磁性 vdW 异质结构。它们的光学特性与层数、电荷转移、缺陷、应变和扭曲角堆叠密切相关,这为控制其物理性质提供了一个多功能平台。在此,我们回顾了最近在范德华材料和异质结构的激子和谷特性方面的一些发现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Mrs Bulletin
Mrs Bulletin 工程技术-材料科学:综合
CiteScore
7.40
自引率
2.00%
发文量
193
审稿时长
4-8 weeks
期刊介绍: MRS Bulletin is one of the most widely recognized and highly respected publications in advanced materials research. Each month, the Bulletin provides a comprehensive overview of a specific materials theme, along with industry and policy developments, and MRS and materials-community news and events. Written by leading experts, the overview articles are useful references for specialists, but are also presented at a level understandable to a broad scientific audience.
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