Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin of Multiferroicity in MnWO4   MnWO4 is regarded as a canonical example of multiferroic materials, where the
multiferroic activity is caused by a spin-spiral alignment. We argue that, in
reality, MnWO4 has two sources of the spin-spirality, which conflict with each
other. One is the Dzyaloshinskii-Moriya (DM) interactions, reflecting the P2/c
symmetry of the lattice. The P2/c structure of MnWO4 has an inversion center,
that connects two Mn sublattices. Therefore, from the viewpoint of DM
interactions, different Mn sublattices are expected to have opposite spin
chirality. Another source is competing isotropic exchange interactions, which
tend to form a spin-spiral texture with the same chirality in both magnetic
sublattices. Thus, there is a conflict between DM and isotropic exchange
interactions, which makes these two sublattices inequivalent and, therefore,
breaks the inversion symmetry. Our theoretical analysis is based on the
low-energy model, derived from the first-principles electronic structure
calculations.

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The categories of this paper are: q-bio
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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: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph