The power law suppression of the density of states of Au/Si(001) is not a unique characteristic of the quasi one-dimensional superstructure.

Metallic atoms that induce self-assembly of quasi one- dimensional (1D) chains on semiconductor surfaces have been extensively investigated in search of Tomonaga-Luttinger liquid (TLL) physics. Of the many investigated self assembled quasi 1D systems on semiconductor surfaces, only Au/Ge(001), and Bi/InSb(001) were claimed to host TLL physics; the power law suppression of the density of states (DoS) towards the chemical potential being one of the hallmarks of TLL physics. However, the TLL nature of Au/Ge(001) has been contested by other studies.
Recently, we have observed a power law suppression of the DoS for the quasi 1D Au-induced chain structure on the Si(001) surface. The Au-induced self-assembled quasi 1D chain structures of both Au/Si(001) and Au/Ge(001) are c (2 × 8) reconstructions according to their LEED measurements; which is achieved at relatively higher temperatures of Au deposition.
In order to shade some light in the field, we studied, using LEED and ARPES, Au deposition on vicinal Si(001) surface at different deposition temperatures, i.e., different structural phases. We report that we observed a ubiquitous power law suppression of the DoS for all the other structural phases as well, including for the room temperature deposited disordered phase of Au on Si(001).