Due to the large exciton binding energy, two-dimensional (2D) transition metal dichalcogenides (TMDCs) provide an ideal platform for studying excitonic states and related photonics and optoelectronics. Polarization states lead to distinct light-matter interactions which are of great importance for device applications. In this work, we study polarized photoluminescence spectra from intralayer exciton and indirect exciton in WS₂ and WSe₂ atomic layers, and interlayer exciton in WS₂/WSe₂ heterostructures by radially and azimuthally polarized cylindrical vector laser beams. We demonstrated the same in-plane and out-of-plane polarization behavior from the intralayer and indirect exciton. Moreover, with these two laser modes, we obtained interlayer exciton in WS₂/WSe₂ heterostructures with stronger out-of-plane polarization, due to the formation of vertical electric dipole moment.

由于激子结合能大，二维 (2D) 过渡金属二硫属化物 (TMDC) 为研究激子态和相关的光子学和光电子学提供了理想的平台。偏振态导致不同的光物质相互作用，这对于设备应用非常重要。在这项工作中，我们研究了 WS ₂和 WSe ₂原子层中的层内激子和间接激子以及 WS ₂ /WSe _{2 中的}层间激子的偏振光致发光光谱通过径向和方位角偏振圆柱矢量激光束形成异质结构。我们展示了来自层内和间接激子的相同面内和面外极化行为。此外，使用这两种激光模式，由于垂直电偶极矩的形成，我们在具有更强面外偏振的WS ₂ /WSe ₂异质结构中获得了层间激子。