Phys. Rev. Lett. 86, 4632–4635 (2001)Band Splitting for Si(557)-Au: Is It Spin-Charge Separation?Received 24 October 2000; published in the issue dated 14 May 2001 It has been proposed that the Si(557)-Au surface exhibits spin-charge separation in a one-dimensional electron liquid. Two narrowly spaced bands are found which exhibit a well-defined splitting at the Fermi level. That is incompatible with the assignment to a spinon-holon pair in a Luttinger liquid. Instead, we propose that the two bands are associated with two nearly degenerate atomic chains, or a chain of step atoms with two broken bonds. Such an assignment explains why the surface is metallic despite an even number of electrons per unit cell. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4632
DOI:
10.1103/PhysRevLett.86.4632
PACS:
73.20.At, 71.10.Pm, 79.60.Jv
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