Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal orientation of striped states in the quantum Hall system against
  external modulations   We study striped states in the quantum Hall system around half-filled high
Landau levels and obtain the optimal orientation of the striped state in the
presence of an external unidirectional periodic potential. It is shown that the
optimal orientation is orthogonal to the external modulation in the Coulomb
dominant regime (the orthogonal phase) and is parallel in the external
modulation dominant regime (the parallel phase). The phase boundary of these
two phases is determined numerically in the parameter space of the strength and
wave number of the external modulation at the half-filled third Landau level.

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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: cs
3
The categories of this paper are: physics
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The categories of this paper are: nlin