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The collective electronic excitations of arrays of Au chains on regularlystepped Si(553) and Si(775) surfaces were studied using electron lossspectroscopy with simultaneous high energy and momentum resolution (ELS-LEED)in combination with low energy electron diffraction (SPA-LEED) and tunnelingmicroscopy. Both surfaces contain a double chain of gold atoms per terrace.Although one-dimensional metallicity and plasmon dispersion is observed onlyalong the wires, two-dimensional effects are important, since plasmondispersion explicitly depends both on the structural motif of the wires and theterrace width. The electron density on each terrace turns out to be modulated,as seen by tunneling spectroscopy (STS). The effective wire width of 7.5\,\AA\for Si(553)-Au -- 10.2\,\AA\ for Si(775)-Au -- , determined from plasmondispersion is in good agreement with STS data. Clear evidence for couplingbetween wires is seen beyond nearest neighbor coupling.

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires