Liang Yan, Li Fengmiao, Wang Weihua, Yang Hao, Guo Jiandong
College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, People's Republic of China. Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
J Phys Condens Matter. 2016 Sep 14;28(36):365003. doi: 10.1088/0953-8984/28/36/365003. Epub 2016 Jul 8.
The adsorption behavior of Sr adatoms on the SrTiO3 (1 1 0)-(4 × 1) reconstructed surface with Ti2O3 vacancies distributed in a superstructure is studied by scanning tunneling microscopy and density functional theory calculations. With the adsorption amount increasing, all the Sr adatoms between adjacent Ti2O3 vacancies are closely packed along the quasi-1D stripes on the surface with a uniform separation from each other. The formation of such adatom chains is determined by the surface strain relief-the local lattice relaxations in response to Sr adatoms and Ti2O3 vacancies are incompatible, leading to the strong repulsive interaction between them. Consequently the distribution of Sr chains follows the long-range order of the growth template with their length tunable in a certain range by evaporation amount.
通过扫描隧道显微镜和密度泛函理论计算，研究了具有超结构中分布的Ti2O3空位的SrTiO3(1 1 0)-(4×1)重构表面上Sr吸附原子的吸附行为。随着吸附量的增加，相邻Ti2O3空位之间的所有Sr吸附原子沿着表面上的准一维条纹紧密堆积，彼此之间具有均匀的间距。这种吸附原子链的形成是由表面应变弛豫决定的——响应于Sr吸附原子和Ti2O3空位的局部晶格弛豫不兼容，导致它们之间存在强烈的排斥相互作用。因此，Sr链的分布遵循生长模板的长程有序，其长度可通过蒸发量在一定范围内调节。
