Electronic localization of quantum-well states in Ag/Au(111) metallic heterostructures

F. Forster, E. Gergert, A. Nuber, H. Bentmann, Li Huang, X. G. Gong, Z. Zhang, and F. Reinert

Phys. Rev. B 84, 075412 – Published 3 August 2011

Abstract

We report on a detailed analysis of the evolution and spatial localization of quantum-well states (QWSs) in Ag layers on a Au(111) substrate by means of high-resolution photoelectron spectroscopy combined with model calculations based on a simple particle-in-a-box picture, the phase accumulation model, and density functional theory-based slab-layer calculations. Due to the finite electron escape depth we could link the photoemission intensity of the QWS to the simulated charge-density distribution and therewith confirm the calculated localization of these states. The first QWS starts to be localized within the Ag film at layer thicknesses $>$ 7 ML.

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Received 22 March 2011

DOI:https://doi.org/10.1103/PhysRevB.84.075412

Authors & Affiliations

F. Forster^1,*, E. Gergert¹, A. Nuber¹, H. Bentmann¹, Li Huang^2,3, X. G. Gong², Z. Zhang^4,5, and F. Reinert^1,6,†

¹Universität Würzburg, Experimentelle Physik VII and Röntgen Research Center for Complex Materials RCCM, Am Hubland, D-97074 Würzburg, Germany
²Surface Physics Laboratory and Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China
³Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, USA
⁴Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁵ICQD/HFNL, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China
⁶Karlsruher Institut für Technologie KIT, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany

^*Present address: Staatliches Studienseminar für das Lehramt an Gymnasien und Gesamtschulen, Saarland, St. Nazairer Allee 6, D-66740 Saarlouis, Germany.
^†Corresponding author: reinert@physik.uni-wuerzburg.de

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Vol. 84, Iss. 7 — 15 August 2011

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