Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 84: Heterostructures and Interfaces
HL 84.11: Vortrag
Freitag, 24. März 2017, 12:30–12:45, POT 151
Spilling of electronic states in Pb quantum wells on Si(111)-Au surface — Mieczysław Jałochowski1, •Krisztián Palotás2,3, and Mariusz Krawiec1 — 1Marie Curie-Skłodowska University, Lublin, Poland — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
Energy-dependent apparent step heights of two-dimensional ultrathin Pb islands grown on the Si(111)6x6-Au surface have been investigated by a combination of scanning tunneling microscopy, first-principles density-functional theory and particle-in-a-box model calculations [1]. The apparent step height shows thickness- and 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, which can reach values as high as the half of the atomic contribution at certain energies. The applicability of the particle-in-a-box model to the spilling of electron states is also discussed.
[1] M. Jałochowski et al., Phys. Rev. B 93, 035437 (2016)