Abstract
The electronic structure of the $\text{Ge}(001)c(8\ifmmode\times\else\texttimes\fi{}2)\text{-Au}$ surface has been investigated by means of angle-resolved photoelectron spectroscopy. The atomic structure of the surface includes nanowires along the $⟨110⟩$ direction separated by deep grooves, which were observed by scanning tunneling microscopy. The dispersion relation along the $⟨110⟩$ direction showed the existence of a metallic surface-state band in accordance with $8\ifmmode\times\else\texttimes\fi{}$ periodicity. Moreover, the Fermi-surface measurement revealed that the band has an ellipsoidal shape, indicating an anisotropic two-dimensional metallic state. This is in contrast to the previously reported one-dimensional character of the system [J. Sch\afer, C. Blumenstein, S. Meyer, M. Wisniewski, and R. Claessen, Phys. Rev. Lett. 101, 236802 (2008)]. A structural model including periodic arrangement of Au adsorbed (111) nanofacets was examined by comparing the electronic structure with that of the flat $\text{Ge}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\text{-Au}$ surface.
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