论文标题
介电环境对中性和充电的深色激子在WSE $ _2 $单层中的影响
The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe$_2$ monolayer
论文作者
论文摘要
半导体过渡金属二核苷的原子上薄单层（ML）的介电环境会影响ML中电子带隙和激子结合能。我们研究了环境对WSE $ _2 $ ml中中性和带电的深色激子排放的平面磁场亮度的影响。研究了放置在三个介电环境中的单层，尤其是固定在HEXAGONARE BN（HBN）薄片中的ML，沉积在HBN层上的ML，以及HBN Flake和SIO $ _2 $/SI/SI/SI底物之间的ML。我们观察到中性和带电的深色激子的亮度速度取决于介电环境，这可能与ML中载体浓度水平的变化有关。此外，周围的介质以不同的介电常数为特征，它影响了中性和带电的深色激子的相对能量，参考明亮的激子。
The dielectric environment of atomically-thin monolayer (ML) of semiconducting transition metal dichalcogenides affects both the electronic band gap and the excitonic binding energy in the ML. We investigate the effect of the environment on the in-plane magnetic field brightening of neutral and charged dark exciton emissions in the WSe$_2$ ML. The monolayers placed in three dielectric environments are studied, in particular, the ML encapsulated in hexagonal BN (hBN) flakes, the ML deposited on a hBN layer, and the ML embedded between the hBN flake and SiO$_2$/Si substrate. We observe that the brightening rates of the neutral and charged dark excitons depend on the dielectric environment, which may be related to the variation of the level of carrier concentration in the ML. Moreover, the surrounding media, characterized by different dielectric constants, influences weakly the relative energies of the neutral and charged dark excitons in reference to the bright ones.
