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Title: Electronic properties of the leaky quantum-well system Ag(111)/Au/Ag

Abstract

Angle-resolved photoemission has been employed to examine the electronic properties of a lattice-matched, epitaxial system prepared by depositing first a thin Au(111) layer on a Ag(111) substrate, and then a Ag(111) overlayer. The Au layer acts as a potential barrier for electron motion in the system. The Ag overlayer can be regarded as a quantum well, but in our experiment, the Au barrier is rather thin, and there is substantial coupling between the valence electrons in the Ag overlayer and the continuum states in the substrate. Nevertheless, well-defined quantum-well resonances are observed for Au barriers as thin as two atomic layers. These resonances can be understood as a result of partial trapping of valence electrons in the Ag overlayer. A calculation which takes into account the band structure and surface properties is carried out, and the results are in good agreement with the experiment. Initial- and final-state features in the spectra are identified by comparison with theoretical models. The effects of lattice match or mismatch at the interface will be discussed. {copyright} {ital 1996 The American Physical Society.}

Authors:
; ;  [1]
  1. Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080 (United States)
Publication Date:
OSTI Identifier:
389306
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 54; Journal Issue: 15; Other Information: PBD: Oct 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GOLD; ELECTRONIC STRUCTURE; SILVER; THIN FILMS; SURFACE PROPERTIES; ENERGY SPECTRA; QUANTUM WELLS; SURFACE STATES

Citation Formats

McMahon, W E, Miller, T, Chiang, T, and Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801-2902. Electronic properties of the leaky quantum-well system Ag(111)/Au/Ag. United States: N. p., 1996. Web. doi:10.1103/PhysRevB.54.10800.
McMahon, W E, Miller, T, Chiang, T, & Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801-2902. Electronic properties of the leaky quantum-well system Ag(111)/Au/Ag. United States. doi:10.1103/PhysRevB.54.10800.
McMahon, W E, Miller, T, Chiang, T, and Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801-2902. Tue . "Electronic properties of the leaky quantum-well system Ag(111)/Au/Ag". United States. doi:10.1103/PhysRevB.54.10800.
@article{osti_389306,
title = {Electronic properties of the leaky quantum-well system Ag(111)/Au/Ag},
author = {McMahon, W E and Miller, T and Chiang, T and Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801-2902},
abstractNote = {Angle-resolved photoemission has been employed to examine the electronic properties of a lattice-matched, epitaxial system prepared by depositing first a thin Au(111) layer on a Ag(111) substrate, and then a Ag(111) overlayer. The Au layer acts as a potential barrier for electron motion in the system. The Ag overlayer can be regarded as a quantum well, but in our experiment, the Au barrier is rather thin, and there is substantial coupling between the valence electrons in the Ag overlayer and the continuum states in the substrate. Nevertheless, well-defined quantum-well resonances are observed for Au barriers as thin as two atomic layers. These resonances can be understood as a result of partial trapping of valence electrons in the Ag overlayer. A calculation which takes into account the band structure and surface properties is carried out, and the results are in good agreement with the experiment. Initial- and final-state features in the spectra are identified by comparison with theoretical models. The effects of lattice match or mismatch at the interface will be discussed. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevB.54.10800},
journal = {Physical Review, B: Condensed Matter},
number = 15,
volume = 54,
place = {United States},
year = {1996},
month = {10}
}