Zandvliet Harold J W, van Houselt Arie, Poelsema Bene
Physical Aspects of NanoElectronics and Solid State Physics, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
J Phys Condens Matter. 2009 Nov 25;21(47):474207. doi: 10.1088/0953-8984/21/47/474207. Epub 2009 Nov 5.
The structural and electronic properties of self-lacing atomic chains on Pt modified Ge(001) surfaces have been studied using low-temperature scanning tunnelling microscopy and spectroscopy. The self-lacing chains have a cross section of only one atom, are perfectly straight, thousands of atoms long and virtually defect free. The atomic chains are composed of dimers that have their bonds aligned in a direction parallel to the chain direction. At low temperatures the atomic chains undergo a Peierls transition: the periodicity of the chains doubles from a 2 × to a 4 × periodicity and an energy gap opens up. Furthermore, at low temperatures (T<80 K) novel quasi-one-dimensional electronic states are found. These quasi-one-dimensional electronic states originate from an electronic state of the underlying terrace that is confined between the atomic chains.
利用低温扫描隧道显微镜和光谱学研究了铂修饰的Ge(001)表面上自缚原子链的结构和电子性质。自缚原子链的横截面只有一个原子，非常笔直，长达数千个原子且几乎无缺陷。原子链由二聚体组成，其键沿与链方向平行的方向排列。在低温下，原子链经历皮尔斯转变：链的周期性从2×翻倍至4×，并打开一个能隙。此外，在低温（T<80 K）下发现了新型准一维电子态。这些准一维电子态源自位于原子链之间的底层平台的一个电子态。
