Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-current order in anisotropic triangular antiferromagnets   We analyze instabilities of the collinear up-up-down state of a
two-dimensional quantum spin-S spatially anisotropic triangular lattice
antiferromagnet in a magnetic field. We find, within large-S approximation,
that near the end point of the plateau, the collinear state becomes unstable
due to condensation of two-magnon bound pairs rather than single magnons. The
two-magnon instability leads to a novel 2D vector chiral phase with alternating
spin currents but no magnetic order in the direction transverse to the field.
This phase breaks a discrete Z_2 symmetry but preserves a continuous U(1) one
of rotations about the field axis. It possesses orbital antiferromagnetism and
displays a magnetoelectric effect.

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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: patt-sol