论文标题
WS $ _2 $单层中准粒子的动态筛选
Dynamic screening of quasiparticles in WS$_2$ monolayers
论文作者
论文摘要
我们揭示了单层筛查单层WS $ _2 $的非平衡激子动力学中的准粒子筛选的影响。我们报告了泵光子能量依赖的激子蓝色和红移来自时间分辨 - 反射对比度测量值。基于现象学模型，我们隔离了激子和游离载体对准无颗粒带隙，激子结合能和线宽扩展的有效影响。这样，我们的工作不仅提供了竞争现象的全面图片，该现象在PhotoExcitation时在ws $ _2 $中的激子动力学中提供了综合现象，而且还证明了激子和载体对库仑相互作用动态筛查的贡献差异很大。
We unravel the influence of quasiparticle screening in the non-equilibrium exciton dynamics of monolayer WS$_2$. We report pump photon energy-dependent exciton blue and red-shifts from time-resolved-reflectance contrast measurements. Based on a phenomenological model, we isolate the effective impact of excitons and free carriers on the renormalization of the quasi-free particle band gap, exciton binding energy and linewidth broadening. By this, our work does not only provide a comprehensive picture of the competing phenomena governing the exciton dynamics in WS$_2$ upon photoexcitation, but also demonstrates that exciton and carrier contributions to dynamic screening of the Coulomb interaction differ significantly.
