发表机构
ITMO University; Pohang University of Science and Technology (POSTECH); Harvard University; Tongji University（ITMO大学; 浦项科技大学; 哈佛大学; 同济大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用局域应变工程，在MoS₂/WSe₂异质双层中实现莫尔激子的室温激活与连续调谐，为室温量子激子器件奠定基础。
AI 中文摘要
原子级厚度的过渡金属二硫化物异质双层中的莫尔超晶格是探索量子多体物理的多功能平台，因为它们可以捕获激子，形成量子化的莫尔激子态。然而，这类莫尔激子主要在低温下被研究，严重限制了其实际应用。本研究利用局域应变工程，在MoS₂/WSe₂异质双层中实现了莫尔激子的室温激活与控制。通过改性原子力显微镜针尖施加机械应变，观察到一系列归因于莫尔势中受限的层间激子态的共振。功率依赖的光致发光测量阐明了莫尔激子态的布居动力学，而可控局域应变可将其发射波长连续调谐至第二电信窗口中心。研究提供的理论模型捕捉了所有实验观测特征，包括莫尔激子发射的非传统光谱形状。本发现确立了针尖诱导的局域应变作为按需操控莫尔激子的强大工具，为室温量子激子器件铺平了道路。
英文摘要
Moiré superlattices in heterobilayers of atomically thin transition metal dichalcogenides provide a versatile platform for exploring quantum many-body physics as they can trap excitons, leading to the formation of quantized moiré exciton states. However, such moiré excitons have been predominantly studied at cryogenic temperatures, which severely limits their practical applications. Here, we demonstrate room-temperature activation and control of moiré excitons in MoS$_2$/WSe$_2$ heterobilayers using local strain engineering. Applying mechanical strain with a modified atomic force microscopy tip, we observe a series of resonances attributed to interlayer exciton states confined in the moiré potential. Power-dependent photoluminescence measurements elucidate the population dynamics of the moiré exciton states, while controlled local strain enables continuous tuning of their emission wavelength to the center of the second telecom window. We provide a theoretical model that captures all experimentally observed features, including the unconventional spectral shape of the moiré exciton emission. Our findings establish local tip-induced strain as a powerful tool for the on-demand manipulation of moiré excitons, paving the way for room-temperature quantum excitonic devices.
