Spilling of electronic states in Pb quantum wells | |
Article | |
关键词: SCANNING-TUNNELING-MICROSCOPY; ULTRATHIN METALLIC-FILMS; BY-LAYER GROWTH; THIN-FILMS; LOW-TEMPERATURES; LEAD FILMS; SIZE; SURFACE; OSCILLATIONS; PHOTOEMISSION; | |
DOI : 10.1103/PhysRevB.93.035437 | |
来源: SCIE |
【 摘 要 】
Energy-dependent apparent step heights of two-dimensional ultrathin Pb islands grown on the Si(111)6 x 6-Au surface have been investigated by a combination of scanning tunneling microscopy, first-principles density-functional theory, and the particle-in-a-box model calculations. The apparent step height shows the thicknessand energy-dependent oscillatory behaviors, which are directly related to the spilling of electron states into the vacuum exhibiting a quantum size effect. This has been unambiguously proven by extensive first-principles scanning tunneling microscopy and spectroscopy simulations. An electronic contribution to the apparent step height is directly determined. At certain energies it reaches values as high as a half of the atomic contribution. The applicability of the particle-in-a-box model to the spilling of electron states is also discussed.
【 授权许可】
Free