论文标题
负电荷的2 $ s $激子的磁光测量值WSE $ _2 $
Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe$_2$
论文作者
论文摘要
单层过渡金属二进制基因源具有各种光学激发的准粒子物种，这些物种源自二维限制，结合了相对较大的载体有效质量和降低的介电筛选。这些准颗粒的磁反应提供了有关其旋转和山谷构型，细微的载体相互作用以及对基础带结构的信息的信息。最近，有几份报道说，TMD中有2美元的$ S $/3 $ S $带电的激子，但对它们对外部磁场的反应知之甚少。使用光致发光激发光谱，我们观察到2 $ s $带电的激子的存在，并首次报告其对施加磁场的响应。我们对中性激子进行基于此响应，并发现2 $ s $中性和充电的激子与G $ _ {\ rm {\ rm {x_0^{2S}}}} $ = -5.20 $ = -5.20 $ \ pm $ 0.11和$ 0.11和$ 0.11和$ 0.11和$ 0.11 and g $ _ { g $ _ {\ rm {x _--^{2S}}} $ = - 4.98 $ \ pm $ 0.11。
Monolayer transition metal dichalcogenides host a variety of optically excited quasiparticles species that stem from two-dimensional confinement combined with relatively large carrier effective masses and reduced dielectric screening. The magnetic response of these quasiparticles gives information on their spin and valley configurations, nuanced carrier interactions, and insight into the underlying band structure. Recently, there have been several reports of 2$s$/3$s$ charged excitons in TMDs, but very little is still known about their response to external magnetic fields. Using photoluminescence excitation spectroscopy, we observe the presence of the 2$s$ charged exciton and report for the first time its response to an applied magnetic field. We benchmark this response against the neutral exciton and find that both the 2$s$ neutral and charged excitons exhibit similar behavior with g-factors of g$_{\rm{X_0^{2s}}}$=-5.20$\pm$0.11 and g$_{\rm{X_-^{2s}}}$=-4.98$\pm$0.11, respectively.
