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arXiv · 1601.07725

Spilling of electronic states in Pb Quantum Wells

M. Jalochowski·K. Palotas·M. Krawiec
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Abstract

Energy-dependent apparent step heights of two-dimensional ultra-thin Pb islands grown on the Si(111)6$\times$6Au 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 thickness and energy dependent oscillatory behavior, which is 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.

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M. Jalochowski, K. Palotas, M. Krawiec. 2016-01-28. Spilling of electronic states in Pb Quantum Wells. https://doi.org/10.1103/physrevb.93.035437

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