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arXiv 2006.16872cond-mat.mtrl-sciphysics.optics
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层状半导体光谱学指南

Guide to optical spectroscopy of layered semiconductors

Shivangi Shree, Ioannis Paradisanos, Xavier Marie, Cedric Robert, Bernhard Urbaszek

摘要:

在这篇技术评论中,我们介绍了层状材料的光谱学,作为一种强大的,非侵入性的工具,以访问电子能带结构和晶体质量的细节。在光子学和光电子学中的潜在应用是基于我们对原子单层尺度上的光-物质相互作用的理解。在此,原子级薄的过渡金属二硫属化物,例如MoS 2和WSe 2,是具有在光谱的可见区域中的带隙的层状半导体的模型系统。它们可以组装形成异质结构,并结合组成单层的独特性质。本文综述了微光致发光光谱和光吸收实验的工作原理。我们讨论的物理起源的主要吸收和发射光谱中的功能,以及如何可以调整。我们解释了在不同条件下进行实验的实际设置的关键方面,如可变温度或施加磁场,以及检测光斑大小和激发激光波长等参数如何影响光谱。我们描述了直接样品环境,如基板和封装层,对发射和吸收机制的重要影响。调查的光学技术,探测层之间的耦合和分析载流子极化动力学自旋和valleytronics提供。

英文摘要:

In this technical review we give an introduction to optical spectroscopy for layered materials as a powerful, non-invasive tool to access details of the electronic band structure and crystal quality. Potential applications in photonics and optoelectronics are based on our understanding of the light-matter interaction on an atomic monolayer scale. Here atomically thin transition metal dichalcogenides, such as MoS2 and WSe2, are model systems for layered semiconductors with a bandgap in the visible region of the optical spectrum. They can be assembled to form heterostructures and combine the unique properties of the constituent monolayers. We review the working principles of micro-photoluminescence spectroscopy and optical absorption experiments. We discuss the physical origin of the main absorption and emission features in the optical spectra and how they can be tuned. We explain key-aspects of practical set-ups for performing experiments in different conditions such as variable temperatures or in applied magnetic fields and how parameters such as detection spot size and excitation laser wavelength impact the optical spectra. We describe the important influence of the direct sample environment, such as substrates and encapsulation layers, on the emission and absorption mechanisms. A survey of optical techniques that probe the coupling between layers and analyse carrier polarisation dynamics for spin- and valleytronics is provided.

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