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New Journal of Physics 3 (2001) 22.1-22.11
Scanning tunnelling spectroscopy of electron resonators
Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
Department of Physics, University of Bath, BA2 7AY, United Kingdom
Abstract
The electronic structure of artificial Mn atom arrays on Ag(111) is
characterized in detail with scanning tunnelling spectroscopy
and spectroscopic imaging at low temperature. We demonstrate the degree to
which variations in geometry may be used to control spatial
and spectral distributions of surface state electrons confined within
the arrays, how these are influenced by atoms placed within the
structure and how the ability to induce spectral features at specific
energies may be exploited through lineshape analyses to deduce
quasiparticle lifetimes near the Fermi level. Through extensive comparison
of dI/dV maps and spectra we demonstrate the utility of a model
based upon two-dimensional s-wave scatterers for describing and predicting
the characteristics of specific resonators.