Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase separation of antiferromagnetic ground states in systems with
  imperfect nesting   We analyze the phase diagram for a system of weakly-coupled electrons having
an electron- and a hole-band with imperfect nesting. Namely, both bands have
spherical Fermi surfaces, but their radii are slightly different, with a
mismatch proportional to the doping. Such a model is used to describe: the
antiferromagnetism of chromium and its alloys, pnictides, AA-stacked graphene
bilayers, as well as other systems. Here we show that the uniform ground state
of this model is unstable with respect to electronic phase separation in a wide
range of model parameters. Physically, this instability occurs due to the
competition between commensurate and incommensurate antiferromagnetic states
and could be of importance for other models with imperfect nesting.

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The categories of this paper are: hep-th
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The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat