Department of Physics, University of Rostock, D-18051 Rostock, Germany.
Phys Rev Lett. 2012 Aug 10;109(6):066801. doi: 10.1103/PhysRevLett.109.066801. Epub 2012 Aug 7.
On Si(111)-(5×2)-Au it is shown that metallic sections of quantum wires between two doping adatoms establish a local electronic structure which is primarily defined by the section length. Such confined doping is a direct consequence of reduced dimensionality and is not observed in higher dimensions. Within a chain segment, the effect of a spatially independent charge-carrier concentration is superimposed by a Coulomb-like interaction due to the positively charged dopants. This offers a natural explanation for the relatively broad photoemission features and the complex appearance in scanning tunneling microscopy and spectroscopy images.
在 Si(111)-(5×2)-Au 上，研究表明，两个掺杂 adatoms 之间的量子线的金属部分建立了一个局部电子结构，该结构主要由截面长度定义。这种受限掺杂是维度降低的直接结果，在更高维度上不会观察到。在链段内，由于带正电荷的掺杂剂的库仑相互作用，空间独立的电荷载流子浓度的影响被叠加。这为相对较宽的光发射特征以及扫描隧道显微镜和光谱学图像中的复杂外观提供了自然的解释。
