Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for Long-Range Spin Order Instead of a Peierls Transition in
  Si(553)-Au Chains   Stabilization of the Si(553) surface by Au adsorption results in two
different atomically defined chain types, one of Au atoms and one of Si. At low
temperature these chains develop two- and threefold periodicity, respectively,
previously attributed to Peierls instabilities. Here we report evidence from
scanning tunneling microscopy that rules out this interpretation. The x3
superstructure of the Si chains vanishes for low tunneling bias, i.e., close
the Fermi level. In addition, the Au chains remain metallic despite their
period doubling. Both observations are inconsistent with a Peierls mechanism.
On the contrary, our results are in excellent, detailed agreement with the
Si(553)-Au ground state predicted by density-functional theory, where the x2
periodicity of the Au chain is an inherent structural feature and every third
Si atom is spin-polarized.

1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
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The categories of this paper are: stat
5
The categories of this paper are: gr-qc