Manipulation and spectroscopy of quantum structures on semiconductor surfaces by cryogenic scanning tunneling microscopy

低温扫描隧道显微镜（STM）用于从III-V族半导体表面上的原子构建块组装单个纳米结构，并研究其电子特性。构建块是单个吸附原子和原子点缺陷，可以故意创建和定位的STM尖端。这使我们能够在半导体平台上创建最终的小结构，这些结构的大小，形状或成分没有任何随机变化。该项目的中心目标是探索定制纳米结构的特性，调整这些特性并控制它们。核心兴趣是原子构建块之间的电子相互作用，以及它们与半导体环境的相互作用。通过扫描隧道光谱分析纳米结构的电子态和元激发，以深入了解它们的量子物理性质。对这些性质的基本理解对于实现基于量子效应的器件功能和电子输运的未来技术是重要的。

Cryogenic scanning tunneling microscopy (STM) is used to assemble individual nanostructures from atomic building blocks on a III-V semiconductor surface and to investigate their electronic properties. The building blocks are single adsorbed atoms and atomic point defects that can be deliberately created and positioned by the STM tip. This allows us to create ultimately small structures on semiconductor platform which are free of any stochastic variations in their size, shape, or composition. The central goal of the project is to explore the properties of tailored nanostructures, to tune these properties and to control them. Of central interest is the electronic interaction between the atomic building blocks, as well as their interaction with the semiconductor environment. The electronic states and elementary excitations of the nanostructures are analyzed by scanning tunneling spectroscopy to gain insight into their quantum-physical properties. A fundamental understanding of these properties is important for future technologies which implement device function and electronic transport based on quantum effects.