发表机构
Universidad Complutense de Madrid; Université Paris-Saclay; Jagiellonian University（马德里康普顿斯大学; 巴黎萨克雷大学; 雅盖隆大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过ARPES实验在块体MoS$_2$中观测到垂直量子限域导致的量子阱态，其结合能呈线性依赖，源于机械剥离，为研究量子现象和光学性质提供平台。
AI 中文摘要
我们利用角分辨光电子能谱（ARPES）实验观测到块体MoS$_2$中的量子限域态。$\overline{\Gamma}$点的能带结构揭示了与电子垂直量子限域相关的量子阱态（QWSs），这通过k$_z$方向无色散以及光子能量引起的强烈强度调制得到证实。值得注意的是，QWSs的结合能对$n$的依赖并不遵循二维电子气的二次方关系，而是观察到与类抛物线量子阱一致的线性行为。这种限域源于机械剥离制备方法，导致多层堆叠从底层块体上脱离，并通过密度泛函理论（DFT）计算得到证实。类块体MoS$_2$中的量子限域不仅为探索子带间跃迁以利用光学性质提供了机会，也为研究不同厚度多层堆叠中的基本量子现象提供了途径。
英文摘要
We experimentally observe quantum confinement states in bulk MoS$_2$ using Angle-Resolved Photoemission Spectroscopy (ARPES). The band structure at the $\overlineΓ$ point reveals quantum well states (QWSs) linked to vertical quantum confinement of the electrons, confirmed by the absence of dispersion in k$_z$ and a strong intensity modulation with photon energy. Notably, the binding energy dependence of the QWSs vs $n$ does not follow the quadratic dependence of a two-dimensional electron gas. Instead, a linear behaviour is observed that is consistent with a parabolic-like quantum well. This confinement arises from the mechanical exfoliation preparation method, which leads to the detachment of a multilayer stack from the underlying bulk. This is confirmed by Density Functional Theory (DFT) calculations. The quantum confinement in bulk-like MoS$_2$ not only offers the opportunity to explore intersubband transitions to exploit optical properties but also provides a means to study fundamental quantum phenomena in multilayer stacks of different thicknesses.
