发表机构
Carl von Ossietzky Universität Oldenburg; Technische Universität Darmstadt; Friedrich Schiller University Jena（奥尔登堡卡尔·冯·奥西茨基大学; 达姆施塔特工业大学; 耶拿弗里德里希·席勒大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究采用少周期光脉冲与光电子发射显微镜，对WSe₂/MoSe₂横向异质结构的光电子发射开展时空分辨研究，提取了光电子发射非线性特性及动态结合能，为电荷载流子动力学表征提供了高分辨率技术支持。
AI 中文摘要
单层形式的过渡金属二硫族化合物（TMDs）是下一代光电子学的重要平台，尤其可通过纳米级电场对其稳定激子态进行局域调控；这些局域态可通过空间结构化以及定制光脉冲驱动的超快场调制实现动态控制。表征由此产生的快速、纳米级电荷载流子动力学需要具备超高空间和时间分辨率的技术。本研究使用光子能量为0.62 eV的少周期光脉冲，对由单层WSe₂和MoSe₂构成的横向异质结构的基态与激发态光电子发射开展时空分辨研究；利用光电子发射显微镜对单层结构的高度非线性光电子发射进行空间分辨，分辨率达几十纳米。通过改变激光脉冲能量，提取光电子发射过程的非线性特性，从而以高时空分辨率获得光激发前后光电子的动态结合能。
英文摘要
Transition metal dichalcogenides (TMDs) in their monolayer form offer a premier platform for next-generation optoelectronics, particularly through the local manipulation of their robust excitonic states using nanoscale electric fields. These localized states can be dynamically controlled through spatial structuring as well as through ultrafast field modulations driven by tailored optical pulses. Characterizing the resulting rapid, nanoscale charge carrier dynamics requires a technique with exceptional spatial and temporal resolution. Here, we report on the spatio-temporally resolved investigation of ground state and excited state photoemission from a lateral heterostructure built of monolayers of WSe$_2$ and MoSe$_2$ using few-cycle light pulses with a photon energy of 0.62 eV. We utilize photoemission electron microscopy to spatially resolve the highly nonlinear photoemission from the monolayer structure with few tens of nanometer resolution. By varying the laser pulse energy, we extract the nonlinearity of the photoemission process and thus the dynamic binding energy of the photoelectrons before and after optical excitation with high spatial and temporal resolution.
Comments10 pages, 4 figures
