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The electronic states of Au-induced atomic nanowires on Ge(001) (Au/Ge(001)NWs) have been investigated by angle-resolved photoelectron spectroscopy withlinearly polarized light. We have found three electron pockets around$\bar{J}\bar{K}$, where the Fermi surfaces are closed in a surface Brillouinzone, indicating that the surface states of Au/Ge(001) NWs are two-dimensionalwhereas the atomic structure is one-dimensional. The two-dimensional metallicstates exhibit remarkable suppression of the photoelectron intensity near aFermi energy. This suppression can be explained by the correlation andlocalization effects in disordered metals, which is a deviation from aFermi-liquid model.

Deviation from Fermi-liquid behavior in two-dimensional surface states of Au-induced nanowires on Ge(001) by correlation and localization