石墨烯上偶数层褶皱型SnTe单层薄膜电子结构的直接观测
Direct observation of the electronic structure of even-layer puckered SnTe monolayer films on graphene
- National Institute for Materials Science（物质材料研究机构）
- Institute for Molecular Science（分子科学研究所）
- Tohoku University（东北大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
通过角分辨光电子能谱等手段直接观测石墨烯上单层SnTe的电子结构，证实其为褶皱型偶数层结构，并揭示石墨烯的主动界面作用及厚度演化趋势。
AI中文摘要：
我们通过角分辨光电子能谱直接观测了石墨烯上单层SnTe的电子结构。结合低能电子衍射、动量显微镜、芯能级光谱和第一性原理计算，我们表明所观测到的单层极限电子结构与褶皱型偶数层双原子层构建单元一致，而非非褶皱的方形平铺结构。观测到的能带色散及其偏振依赖关系可由具有衬底重整化褶皱幅度的褶皱结构重现。我们进一步表明，石墨烯通过选择其面内取向织构、重整化褶皱幅度以及修饰单层极限下的局域界面静电环境，与超薄SnTe发生主动相互作用。相比之下，多层SnTe表现出更环状的动量空间分布、层间劈裂的价带以及更强的p型特征，揭示了从界面稳定的褶皱超薄极限向更类体态转变的厚度演化开端。
英文摘要：
We report a direct observation of the electronic structure of monolayer SnTe on graphene by angle-resolved photoemission spectroscopy. By combining low-energy electron diffraction, momentum microscopy, core-level spectroscopy, and first-principles calculations, we show that the observed monolayer-limit electronic structure is consistent with a puckered even-layer biatomic-layer building block rather than a nonpuckered square-flat structure. The observed band dispersion and its polarization dependence are reproduced by a puckered structure with a substrate-renormalized buckling amplitude. We further show that graphene actively interacts with ultrathin SnTe by selecting its in-plane orientational texture, renormalizing the buckling amplitude, and modifying the local interfacial electrostatic environment in the monolayer limit. In comparison, multilayer SnTe exhibits a more ringlike momentum-space distribution, interlayer-split valence bands, and a stronger p-type character, revealing the onset of thickness evolution from an interface-stabilized puckered ultrathin limit toward a more bulklike state.
