论文标题
分子薄膜的带状结构中原子晶体的特征
Signatures of an Atomic Crystal in the Band Structure of a Molecular Thin Film
论文作者
论文摘要
分子材料中的转运现象与轨道特征和价状态的定位程度本质上有关。在这里，我们将角度分辨光发射与光发射断层扫描结合在一起，以确定c $ _ {60} $薄膜的价带结构的所有分子状态的空间分布。尽管两个最边界的价值状态表现出强大的带分散，但较大结合能的状态的特征是能量和动量空间中的不同发射模式。我们的发现表明，在具有离域$π$样价状态的分子固体中形成了原子晶体样条带结构，并在较大的结合能处形成了强烈的局部定位$σ$ state。
Transport phenomena in molecular materials are intrinsically linked to the orbital character and the degree of localization of the valence states. Here, we combine angle-resolved photoemission with photoemission tomography to determine the spatial distribution of all molecular states of the valence band structure of a C$_{60}$ thin film. While the two most frontier valence states exhibit a strong band dispersion, the states at larger binding energies are characterized by distinct emission patterns in energy and momentum space. Our findings demonstrate the formation of an atomic crystal-like band structure in a molecular solid with delocalized $π$-like valence states and strongly localized $σ$-states at larger binding energies.
