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The d xy type Tamm state of Cu(001) is strongly modified at the corresponding vicinal faces Cu(10N). There is a considerable band narrowing owing to the confinement of electrons at the (001) terraces. By means of a tight binding scheme, the bandwidth is calculated as a function of N. From band calculation of the surface state, the broadening of the photoemission peak is obtained in dependence...
In addition to the inverse lifetime, the photoemission peak width of a surface state depends on the quality of the surface. For a stepped surface, in particular, there is an energy shift of the surface state owing to the confinement of electrons. A random distribution of steps causes an asymmetric peak broadening, which is examined as a function of the shift parameter, the inverse lifetime and the...
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