Liu Canhua, Matsuda Iwao, Hobara Rei, Hasegawa Shuji
Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Phys Rev Lett. 2006 Jan 27;96(3):036803. doi: 10.1103/PhysRevLett.96.036803. Epub 2006 Jan 25.
Using angle-resolved photoemission spectroscopy, we investigate changes in the band dispersion of a free-electron-like surface state of [FORMULA: SEE TEXT], induced by adsorption of submonolayer Au adatoms. At room temperature, where the adatoms are in a two-dimensional adatom-gas phase, electrons are transferred from the Au adatoms to the substrate, shifting the surface band downwards and causing it to deviate from a parabolic dispersion. At 135 K where the Au adatoms are frozen at specific sites of the substrate, the band splits into two. This band splitting can be explained in terms of hybridization between the unperturbed surface band and the localized virtual bound states induced by the Au adatoms.
利用角分辨光电子能谱，我们研究了亚单层金吸附原子吸附所诱导的[化学式：见正文]类自由电子表面态的能带色散变化。在室温下，吸附原子处于二维吸附原子气相，电子从金吸附原子转移到衬底，使表面能带向下移动并使其偏离抛物线色散。在135K时，金吸附原子冻结在衬底的特定位置，能带分裂成两个。这种能带分裂可以用未受扰动的表面能带与金吸附原子诱导的局域虚束缚态之间的杂化来解释。
