Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonreciprocal superposition state in antiferromagnetic optospintronics   The absence of net magnetization, which forbids any stray magnetic fields, is
one of the greatest advantages of antiferromagnets in device applications. In
conventional antiferromagnets, however, spin current cannot be extracted
without the aid of a static magnetic field. Here, we develop a theory of
antiferromagnetic opto-spintronics to resolve this fundamental dilemma. By
coupling a linearly polarized photon and nonreciprocal magnon bands, we
construct a superposition state of left- and right-handed magnon states with
opposite group velocities. We numerically demonstrate that by using this
superposition state, an antiferromagnetic spin current can be efficiently
generated without a net magnetic field including net magnetization. We also
find that the breakdown of the superposition state induces the stripe
superfluid phase of a two-component Bose-Einstein condensate. Our results lay
the foundation for manipulating the superposition states of emergent particles
in devices.

10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th