Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frustration-Induced Ferrimagnetism in S=1/2 Heisenberg Spin Chain   The ground-state properties of the S=1/2 frustrated Heisenberg spin chain
with interactions up to fourth nearest neighbors are investigated by the
exact-diagonalization method and density matrix renormalization group method.
Our numerical calculations clarify that the ferrimagnetic state is realized in
the ground state in spite of the fact that a multi-sublattice structure in the
shape of the system is absent. We find that there are two types of
ferrimagnetic phases: one is the well-known ferrimagnetic phase of the
Lieb-Mattis type and the other is the nontrivial ferrimagnetic phase that is
different from that of the Lieb-Mattis type. Our results suggest that a
multi-sublattice structure of the shape is not necessarily required for the
occurrence of ferrimagnetism.

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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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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: cs
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The categories of this paper are: comp-gas
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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: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys