Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light-matter interaction in antiferromagnets: the exchange-induced
  magnetic dipole mechanism   We propose a novel mechanism for exchange-induced exciton-magnon absorptions
via hopping between two antiferromagnetically coupled sites and a simultaneous
magnetic dipole transition to an excited orbital state. The obtained selection
rules correspond to ones for magnetic dipole transitions and are in agreement
with the exciton-magnon transitions observed in the quasi one-dimensional
Heisenberg antiferromagnet KCuF3. The calculated magnon density of states in
combination with a structure dependent factor identifies the observed optical
magnon sideband to originate from transverse magnon modes.

32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio