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Interplay between surface and electronic structures in epitaxial Ag ultra thin films on Cu(111)

机译:Cu(111)上外延Ag超薄膜的表面和电子结构之间的相互作用

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摘要

The atomic structure and surface electronic properties of Ag epitaxial ultra-thin films on Cu(111) substrate have been studied by scanning tunneling microscopy (STM) and angle-resolved photoemission (ARPES). In the submonolayer range, Ag films exhibit a surface reconstruction which depends on the preparation temperature. At T = 150 K, a 9 x 9 moire superstructure is observed resulting from the superposition of Ag and Cu lattices whereas at room temperature a triangular structure is stabilized. Photoemission spectroscopy shows that the surface state energy reflects the morphology and the structure of the Ag films. Below one monolayer, two parabolic dispersions indicate the presence of confined surface states in the Cu terraces and in the Ag islands. The different surface state energies associated with the two Ag layer reconstructions allow to study the irreversible transition from the moire to the triangular structure.
机译:通过扫描隧道显微镜(STM)和角分辨光发射(ARPES)研究了Cu(111)衬底上Ag外延超薄膜的原子结构和表面电子性能。在亚单层范围内,Ag膜表现出取决于制备温度的表面重构。在T = 150 K时,观察到由Ag和Cu晶格的叠加产生的9 x 9莫尔条纹的上层结构,而在室温下,三角形结构是稳定的。光发射光谱表明,表面态能反映了银膜的形貌和结构。在一个单层以下,两个抛物线形的分散体表明在铜阶地和银岛中存在受限的表面状态。与两个银层重构相关的不同表面态能量允许研究从莫尔条纹到三角形结构的不可逆转变。

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