Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconventional Singularity in Anti-Parity-Time Symmetric Cavity
  Magnonics   By engineering an anti-parity-time (anti-PT) symmetric cavity magnonics
system with precise eigenspace controllability, we observe two different
singularities in the same system. One type of singularity, the exceptional
point (EP), is produced by tuning the magnon damping. Between two EPs, the
maximal coherent superposition of photon and magnon states is robustly
sustained by the preserved anti-PT symmetry. The other type of singularity,
arising from the dissipative coupling of two anti-resonances, is an
unconventional bound state in the continuum (BIC). At the settings of BICs, the
coupled system exhibits infinite discontinuities in the group delay. We find
that both singularities co-exist at the equator of the Bloch sphere, which
reveals a unique hybrid state that simultaneously exhibits the maximal coherent
superposition and slow light capability.

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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con