论文标题
几层rese $ _2 $的光学签名
The optical signature of few-layer ReSe$_2$
论文作者
论文摘要
展示了厚度从单（1 ml）到Nona-Layer（9 mls）的厚度，厚度为厚度（RESE $ _2 $）的薄层的光学性质。分别在低（$ t $ = 5 K）和房间（$ t $ = 300 K）温度下测量光致发光（PL）和拉曼散射。 RESE $ _2 $层的PL光谱显示两条良好的排放线，当层厚度从9 mLs降低到单层时，它们会蓝光约120 meV。可以在线性链模型中解释观察到的低能拉曼散射模式的丰富结构。在大约120 cm $^{ - 1} $下观察到的两种语体内振动的声子模式，表现出非常敏感和相反的进化，这是层厚度的函数。结果表明，他们的能量差可以作为方便且可靠的工具，以确定$ _2 $薄片的厚度在几层限制中。
Optical properties of thin layers of rhenium diselenide (ReSe$_2$) with thickness ranging from mono- (1 ML) to nona-layer (9 MLs) are demonstrated. The photoluminescence (PL) and Raman scattering were measured at low ($T$=5 K) and room ($T$=300 K) temperature, respectively. The PL spectra of ReSe$_2$ layers display two well-resolved emission lines, which blueshift by about 120 meV when the layer thickness decreases from 9 MLs to a monolayer. A rich structure of the observed low-energy Raman scattering modes can be explained within a linear chain model. The two phonon modes of intralayer vibrations, observed in Raman scattering spectra at about 120 cm$^{-1}$, exhibit very sensitive and opposite evolution as a function of layer thickness. It is shown that their energy difference can serve as a convenient and reliable tool to determine the thickness of ReSe$_2$ flakes in the few-layer limit.
