论文标题
单层Mose中充电的激子动力学$ _2 $附近的铁电域墙附近的linbo $ _3 $
Charged exciton kinetics in monolayer MoSe$_2$ near ferroelectric domain walls in periodically poled LiNbO$_3$
论文作者
论文摘要
半导体过渡金属二分裂基质的单层是一个强烈的新兴平台，用于探索冷凝物质中的量子现象，构建具有增强功能性的新型光电电子设备。由于它们的原子厚度，其激子光学响应对其介电环境高度敏感。在这项工作中，我们探讨了单层厚的摩西的光学特性$ _2 $跨域壁壁边界，以定期使用的linbo $ _3 $。通过空间分辨的光致发光实验揭示了电荷的空间排序以及在边界跨边界上产生的中性和带电的激子。我们的结果揭示了在域壁上具有3000 \，kV/cm的极大的内部电场的证据，其效果表现在激子解离和自由电荷的路由和对相反的螺旋域和非直觉的空间强度依赖性的路由。通过使用漂移扩散和连续性方程对我们的结果进行建模，我们与观察结果获得了出色的定性一致性，并解释了使用逼真的材料参数观察到的空间发光调制。
Monolayers of semiconducting transition metal dichalcogenides are a strongly emergent platform for exploring quantum phenomena in condensed matter, building novel opto-electronic devices with enhanced functionalities. Due to their atomic thickness, their excitonic optical response is highly sensitive to their dielectric environment. In this work, we explore the optical properties of monolayer thick MoSe$_2$ straddling domain wall boundaries in periodically poled LiNbO$_3$. Spatially-resolved photoluminescence experiments reveal spatial sorting of charge and photo-generated neutral and charged excitons across the boundary. Our results reveal evidence for extremely large in-plane electric fields of 3000\,kV/cm at the domain wall whose effect is manifested in exciton dissociation and routing of free charges and trions toward oppositely poled domains and a non-intuitive spatial intensity dependence. By modeling our result using drift-diffusion and continuity equations, we obtain excellent qualitative agreement with our observations and have explained the observed spatial luminescence modulation using realistic material parameters.
