论文标题
Mos $ _ {2} $的单层Ag（111）作为有机分子的脱钩层：分辨率的TCNQ电子和振动状态
Monolayers of MoS$_{2}$ on Ag(111) as decoupling layers for organic molecules: resolution of electronic and vibronic states of TCNQ
论文作者
论文摘要
金属表面上的分子的电子结构在很大程度上由基板电子杂交和筛选确定。结果，能量水平显着扩大和分子特性，例如振动隐藏在光谱线路内。薄脱钩层的插入会减少线宽，并可以访问几乎孤立分子的电子和振动状态的分辨率。在这里，我们使用扫描隧道显微镜和光谱法来表明AG（111）上的MOS $ _ {2} $的单层提供了一个半导体带隙，该频带间隙可以防止分子状态与金属底物进行强相互作用。我们表明，四甲虫 - 奎诺 - 喹啉 - 二甲烷（TCNQ）分子的最低分子轨道（Lumo）的分子（TCNQ）分子明显窄，比裸子底物窄，并且伴随着特征性的卫星结构。在弗朗克 - 康登模型中采用简单的计算，我们揭示了它们的振动起源，并识别具有强电子偶联的模式。
The electronic structure of molecules on metal surfaces is largely determined by hybridization and screening by the substrate electrons. As a result, the energy levels are significantly broadened and molecular properties, such as vibrations are hidden within the spectral lineshapes. Insertion of thin decoupling layers reduces the linewidths and may give access to the resolution of electronic and vibronic states of an almost isolated molecule. Here, we use scanning tunneling microscopy and spectroscopy to show that a single layer of MoS$_{2}$ on Ag(111) provides a semiconducting band gap that may prevent molecular states from strong interactions with the metal substrate. We show that the lowest unoccupied molecular orbital (LUMO) of tetra-cyano-quino-dimethane (TCNQ) molecules is significantly narrower than on the bare substrate and that it is accompanied by a characteristic satellite structure. Employing simple calculations within the Franck-Condon model, we reveal their vibronic origin and identify the modes with strong electron-phonon coupling.
