The overlayer-plasmon dispersion in a K adlayer on Si(001)2×{}1 has been measured by angle-resolved electron-energy-loss spectroscopy. The dispersion of the interband-plasmon mode shows an azimuth-dependent anisotropy, which is in good agreement with recent theories that assume a strongly anisotropic electronic structure. Besides, the intraband-plasmon mode was observed, which identifies a metallic character of the K chains. It is proposed that the K chains adsorbed on Si(001) are in the nature of a one-dimensional metal.
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Aruga et al. (1984) studied this question.
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