论文标题
MOS $ _2 $薄片作为Van der Waals同位结构：发光特性和光学各向异性
MoS$_2$ flake as a van der Waals homostructure: luminescence properties and optical anisotropy
论文作者
论文摘要
我们研究了由高质量MOS $ _2 $ CRYSTAL通过去角质制成的多层板，并揭示它们代表了一个新物体-Van der waals同位结构，该物体由散装核心组成，表面上有一些独立的单层。当从核心的宽发射带被表面单层中强激体共振的吸收峰切割时，该结构包括具有不同电子带结构的元素会导致特定的发光。去角质片表现出强烈的光学各向异性。我们已经观察到正常入射的光两极分化到$ 15 \％$的传输几何形状的转换。这种背景效应是由于C轴相对于正常的波动所致，而明显的共振贡献是通过局部在解剖表面单层条纹中的激子的极化各向异性解释的。
We investigated multilayer plates made by exfoliation from a high-quality MoS$_2$ crystal and reveal that they represent a new object - van der Waals homostructure consisting of a bulk core and a few detached monolayers on its surface. This architecture comprising elements with different electron band structure leads to specific luminescence, when the broad emission band from the core is cut by the absorption peaks of strong exciton resonances in the surface monolayers. The exfoliated flakes exhibit strong optical anisotropy. We have observed a conversion of normally incident light polarization to $15\%$ in transmission geometry. This background effect is due to fluctuations of the c axis relative to the normal, whereas the pronounced resonance contribution is explained by the polarization anisotropy of excitons localized in the stripes of dissected surface monolayers.
