Abstract
We have used photoemission spectroscopy in order to investigate the electronic states and chemical bonding related to Au induced atomic chains on the Ge(001) surface. Angle-resolved photoemission reveals two types of dispersions around the Fermi level whose intensities strongly depend on the incident photon energy. Around , the band structure is dominated by an electronlike band of mainly one-dimensional (1D) character, which shows Tomonaga-Luttinger-like power-law behavior in the -integrated spectral function. In contrast, lower photon energies reveal a metallic holelike dispersion which resembles the Ge bulk structure with its heavy-hole, light-hole, and split-off branches. The Au core-level spectra show two doublets indicating two different Au bonding sites, whereas the Ge core-level shows two surface components and one bulk component.
- Received 15 November 2013
- Revised 26 August 2014
DOI:https://doi.org/10.1103/PhysRevB.90.125409
©2014 American Physical Society