周期极化LiNbO $_3$中铁电畴壁附近单层MoSe $_2$中的带电激子动力学
Charged exciton kinetics in monolayer MoSe$_2$ near ferroelectric domain walls in periodically poled LiNbO$_3$
摘要：
半导体过渡金属二硫属化物的单层是探索凝聚态物质中量子现象的强涌现平台，构建具有增强功能的新型光电器件。由于它们的原子厚度，它们的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MoSe $_2$跨越畴壁边界的周期性极化铌酸锂$_3$的光学性质。空间分辨的光致发光实验揭示了电荷和光生中性和带电激子跨越边界的空间排序。我们的研究结果揭示了在畴壁处存在3000 kV/cm的极大面内电场的证据，其效应表现在激子解离和自由电荷和trions向相反极性畴的路由以及非直观的空间强度依赖性。通过使用漂移扩散和连续性方程对我们的结果进行建模，我们获得了与我们的观测结果非常好的定性一致性，并使用现实的材料参数解释了所观察到的空间发光调制。
英文摘要：
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.
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