Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of Striped Hall Ferromagnets   We study spin and charge striped states at the half-filled high Landau level
in the zero Zeeman energy limit using a Hartree-Fock approximation. It is shown
that a ferromagnetic striped Hall state is more stable than the
antiferromagnetic striped state or charge striped state. We calculate the
collective excitations using the single mode approximation.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga