Transport and collective excitations in metallic wires

在这个项目中，我们研究了不同原子线系统的集体激发和输运性质。这两个性质与电荷密度和有效质量密切相关。其中，Au/Si(HHK)、Au/Ge(100)和硅化物线起主要作用。通过系统地改变支撑、应变外延层和覆盖层的阶跃密度，研究了线耦合及其对输运和等离子体的反馈效应。此外，我们使用吸附材料进行同质异质掺杂实验，以及小分子和大分子(O、H、CO、多环芳烃，如并五苯)来调节表面态的载流子密度以及它们之间的耦合。我们的做法与其他项目的活动密切相关。

In this project we investigate collective excitations and transport properties of different atomic wire systems. These two properties are intimately linked by charge densities and effective masses. Among others Au/Si(hhk), Au/Ge(100) and silicide wires play the central role. By changing systematically the step densities of the supports, strained epilayers, and coverage, the effect of wire coupling and its feedback to transport and plasmons are studied. Moreover, we use adsorbates for homo-hetero doping experiments as well as small and large molecules (O,H,CO, polycyclic aromatics, e.g. pentacene) to tune the carrier densities of the surface states as well as their coupling. Our approach is intimately related to the activities of the other projects.