Graphene nano-flakes weakly coupled to the substrate: atomic structure, electronic states and manipulation

本项目的目标是研究在石墨烯纳米片中由于受限电子态以及由于边缘态而产生的新效应，这些纳米片与块状和边缘的亚星耦合非常弱。这类石墨烯物体的物理学在很大程度上是未被探索的，存在着一系列关于局部电子和磁性的理论和新奇预测，到目前为止还没有得到测试。在这个项目的框架内，扫描隧道显微镜和光谱学的结合以及密度泛函理论的计算将被用来更好地了解准自支撑石墨烯纳米片的电子态、电子动力学和磁性。此外，还将利用STM针尖对石墨烯薄片的横向操纵，以制备原子精确的石墨烯多层结构，并将通过实验和理论方法研究其局域电子结构。

The goal of the present project is the investigation of novel effects that occur due to the confined electronic states as well as the due to the edge states in graphene nano-flakes which are very weakly coupled to substartes in bulk and at the edges. The physics of such graphene objects is largerly unexplored with a range of theories and novel predictions existing about the local electronic and magnetic properties that are untested so far. In the frame of this project a combination of scanning tunneling microscopy and spectroscopy together with the density functional theory calculations will be used to get a better insight into the electronic states, the electron dynamics and magnetic properties of quasi-free-standing graphene nano-flakes. Additionally, lateral maniplulation of graphene flakes by the STM tip will be utilized aiming at the preparation of atomically precise graphene multilayer structures, which local electronic structure will be studied by experimental and theoretical methods.