论文标题
WS $ _2 $单层单层中的单线和三重三角的山谷两极分化在磁场中
Valley polarization of singlet and triplet trions in WS$_2$ monolayer in magnetic fields
论文作者
论文摘要
与HBN中封装的WS $ _2 $单层中不同带负电的激子复合物（TRIONS）相关的光谱特征是根据低温和极化分辨的反射率（RC）和光发光（PL）实验分析的，并具有施加的磁场。基于从RC实验获得的结果，我们表明山谷Zeeman效应在应用外部磁场时通过其能量的演变和相对强度来影响单元和三角形物种的光学响应。我们的分析使我们能够估算$ \ sim 1.3 \ cdot 10^{11} $ cm $^{ - 2} $的免费电子浓度。基于同一样品上的PL实验的观察到的演变是不同的，并且在同一简单的框架中几乎无法理解PL响应中涉及的松弛过程的复杂性。
The spectral signatures associated with different negatively charged exciton complexes (trions) in a WS$_2$ monolayer encapsulated in hBN, are analyzed from low temperature and polarization resolved reflectance contrast (RC) and photoluminescence (PL) experiments, with an applied magnetic field. Based on results obtained from the RC experiment, we show that the valley Zeeman effect affects the optical response of both the singlet and the triplet trion species through the evolution of their energy and of their relative intensity, when applying an external magnetic field. Our analysis allows us to estimate a free electron concentration of $\sim 1.3 \cdot 10^{11}$ cm$^{-2}$. The observed evolutions based on PL experiments on the same sample are different and can hardly be understood within the same simple frame highlighting the complexity of relaxation processes involved in the PL response.
