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首页> 外文期刊>Advanced Functional Materials >Experimental Evidence of Anisotropic and Stable Charged Excitons (Trions) in Atomically Thin 2D ReS_2
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Experimental Evidence of Anisotropic and Stable Charged Excitons (Trions) in Atomically Thin 2D ReS_2

机译：薄原子二维ReS_2中各向异性和稳定带电激子（Trions）的实验证据

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摘要

Experimentally observed, stable trions with large binding energy (approximate to 25 meV) in atomically thin monolayer 2D transition metal dichalcogenides MX2 (M = Mo, W, X = S, Se, and Te) with an isotropic crystal structure have been extensively studied. In contrast, the characteristics of trions in atomically thin 2D materials with an anisotropic crystal structure are not completely understood. Low-temperature photoluminescence (PL) spectroscopy in few-layer ReS2 with an anisotropic crystal structure by applying a gate voltage is described. A new PL peak that emerges below the lower-energy side of neutral excitons obtained by tuning the gate voltages is attributed to emission from negative trions. Furthermore, the trion binding energy that is strongly dependent on the layer thickness reaches a large value of approximate to 60 meV in 1L-ReS2, which is approximate to 2 times larger than that in other isotropic 2D materials (MX2). The enhancement of the binding energy reflects the quasi-1D nature of the trions in anisotropic atomically thin ReS2. These experimental observations will promote a better understanding of the optical response and applications in new categories of the anisotropic atomically thin 2D materials with a quasi-1D nature.
机译：通过实验观察，已经对具有各向同性晶体结构的原子薄单层2D过渡金属双金属双金属硫化物MX2（M = Mo，W，X = S，Se和Te）中具有大结合能（约25 meV）的稳定tri子进行了广泛研究。相反，尚未完全理解具有各向异性晶体结构的原子薄2D材料中tri的特性。描述了通过施加栅极电压在具有各向异性晶体结构的多层ReS2中的低温光致发光（PL）光谱。一个新的PL峰出现在通过调节栅极电压获得的中性激子的较低能量侧以下，这归因于负三极子的发射。此外，在1L-ReS2中，强烈依赖于层厚度的三级子结合能达到大约60 meV的大值，这是其他各向同性2D材料（MX2）的大约2倍。结合能的增强反映了各向异性原子薄ReS2中三子的准1D性质。这些实验观察将促进对光学响应和具有准1D性质的各向异性原子薄2D材料新类别中的应用的更好理解。

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