Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hinge Magnons from Non-collinear Magnetic Order in Honeycomb
  Antiferromagnet   We propose that non-collinear magnetic order in quantum magnets can harbor a
novel higher-order topological magnon phase with non-Hermitian topology and
hinge magnon modes. We consider a three-dimensional system of interacting local
moments on stacked-layers of honeycomb lattice. It initially favors a collinear
magnetic order along an in-plane direction, which turns into a non-collinear
order upon applying an external magnetic field perpendicular to the easy axis.
We exploit the non-Hermitian nature of the magnon Hamiltonian to show that this
field-induced transition corresponds to the transformation from a topological
magnon insulator to a higher-order topological magnon state with a
one-dimensional hinge mode. As a concrete example, we discuss the
recently-discovered monoclinic phase of the thin chromium trihalides, which we
propose as the first promising material candidate of the higher-order
topological magnon phase.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga