Ultrafast nanoscale exciton dynamics via laser-combined scanning tunneling microscopy in atomically thin materials
Ultrafast nanoscale exciton dynamics via laser-combined scanning tunneling microscopy in atomically thin materials
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DOI：
10.1038/s41699-022-00345-1
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发表时间：
2022-10-14
影响因子：
9.7
通讯作者：
Shigekawa, Hidemi
中科院分区：
文献类型：
--
作者：
Mogi, Hiroyuki;Arashida, Yusuke;Shigekawa, Hidemi
在货车德瓦尔斯材料中，发现长期稳定的激子，电子和空穴的束缚对在室温下被处理，为未来高速通信技术开发光电/光子器件铺平了道路。为了实现高效激子器件的功能，理解和操纵纳米结构中的激子动力学是绝对必要的。由于主要用于该领域研究的光学技术的空间分辨率限于μ m到几十nm，因此强烈期望引入新技术。在这里，我们展示了一种方法来探测和可视化中性激子使用激光结合多探针扫描隧道显微镜（STM）系统。超快动力学的激子在纳米结构中产生的面内WS 2/WSe 2异质结构，如在高密度和空间变化的局部缺陷的影响下的寿命的多体效应的ps区域的动态，成功地揭示了与1 nm的空间分辨率。该方法有望加速激子动力学的研究和直接基于纳米尺度实验结果的应用开发。
Long-term stable excitons, bound pairs of electrons and holes, in van der Waals materials were found to be handled at room temperature, paving the way to develop optoelectronic/photonic devices for future high-speed communication technology. To miniaturize and integrate such functions to achieve highly efficient excitonic devices, understanding and manipulation of exciton dynamics in the nanoscale structures is absolutely essential. Since the spatial resolution of the optical techniques, which have been mainly used in the research of this field, is limited to mu m to several tens of nm, the introduction of new technology is strongly desired. Here, we demonstrate a method to probe and visualize neutral excitons using the laser-combined multiprobe scanning tunneling microscopy (STM) system. Ultrafast dynamics of excitons in the nanostructures produced in an in-plane WS2/WSe2 heterostructure, such as dynamics in the ps region of many-body effects under high density and spatial variation in the effect of local defects on lifetime, was successfully revealed with a spatial resolution of 1 nm order. This method is expected to accelerate research on exciton dynamics and the development of applications directly based on the experimental results of nanoscale.