Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comments on Kerr effect and gyrotropic order in cuprates   I comment on two recent papers on Kerr effect as evidence of gyrotropic order
in cuprates, and I suggest that the arguments may not be sound. The difficulty
is that in practically all cases the wave vector $k_{z}$ perpendicular to the
copper-oxygen plane is not a good quantum number. This appears to be
problematic for arXiv:1212.2698, whereas in arXiv:1212.2274 the symmetry
arguments may turn out to be robust, but the microscopic picture is wanting.
Thus, the Kerr effect in cuprates remains a puzzle, as there is little doubt
that the arguments presented against time reversal symmetry breaking appear to
be rather strong in both of these papers on experimental grounds.

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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
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The categories of this paper are: stat