| One-dimensional physics is particularly elegant because of its mathematical transparency. However, it is not easy to realize a one-dimensional system experimentally. Using self-assembly techniques, it has become possible to produce atomic chain structures at silicon surfaces by self-assembly and to control their dimensionality and band filling. The states at the Fermi level lie in the band gap of silicon and are completely de-coupled from the substrate. Angle-resolved photoemission reveals exotic band structures and Fermi surfaces, including a fractional electron count, a spin splitting of the Fermi surface, and the one-dimensional analog of stripes. |
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