Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mechanism for a Chemical Potential of Nonequilibrium Magnons in
  Parametric Parallel Pumping   We demonstrate how a magnon chemical potential is generated in parametric
parallel pumping. We study how a time-periodic magnetic field of this pumping
affects magnon properties of a ferrimagnet in a nonequilibrium steady state. We
show that the magnon distribution function of our nonequilibrium steady state
becomes the Bose distribution function with $\mu=\omega_{\textrm{p}}/2$, where
$\mu$ is the magnon chemical potential and $\omega_{\textrm{p}}$ is the pumping
frequency. This result is distinct from the absence of the magnon chemical
potential in the standard theory and can qualitatively explain its generation
in experiments. We believe our result is a first theoretical demonstration of
the generation of the magnon chemical potential in the parametric parallel
pumping, providing an important step towards a thorough understanding of
properties of nonequilibrium magnons.

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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph