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Phys. Rev. Lett. 87, 107601 (2001) [4 pages]

Electron Confinement in Surface States on a Stepped Gold Surface Revealed by Angle-Resolved Photoemission

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A. Mugarza1,2, A. Mascaraque3, V. Pérez-Dieste3, V. Repain4, S. Rousset4, F. J. García de Abajo5, and J. E. Ortega1,2
1Departamento de Física Aplicada I, Universidad del País Vasco, Plaza Oñati 2, 20018 San Sebastian, Spain
2Donostia International Physics Center (DIPC), Manuel Lardizabal 4, 20018 San Sebastian, Spain
3LURE Centre Universitaire Paris-Sud, Bâtiment 209D B.P. 34, 91898 Orsay Cedex, France
4Groupe de Physique des Solides, Universités Paris 6 et 7, 2 Place Jussieu, 75251 Paris Cedex 5, France
5Centro Mixto CSIC-UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián, Spain

Received 27 February 2001; published 17 August 2001

STM images show that vicinal Au(788) surfaces are made up of a uniform array of (111)-oriented terraces of similar width (∼3.8nm). This uniformity makes it possible to study the electronic structure of the resulting step superlattice by angle-resolved photoemission. We show that for this terrace array the surface state appears to be broken up into one-dimensional quantum-well levels, indicating total electron confinement within the terraces. The angular resolution allows the probability density of the terrace quantum well state to be mapped in reciprocal space, complementing nicely the wave function measured in real space by STM.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.107601
DOI:
10.1103/PhysRevLett.87.107601
PACS:
79.60.Bm, 68.35.Bs, 73.21.-b
 
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