Abstract
A surface state on a stepped Cu(332) surface is studied by angle-resolved photoemission. Based on high-energy electron-diffraction patterns, the (332) sample consists of fairly regularly spaced Cu(111) terraces, which have the form of a strip with a width of about 5--6 atomic rows (about 12 A\r{}). The measured dispersion of the surface state is significantly different from that of the corresponding (111) surface state. Thus, the (332) surface state is delocalized within the surface plane, and the lateral coherence length of the wave function is larger than the terrace width. The dispersion shows a maximum binding energy at the surface Brillouin-zone boundary.
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