Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic coupling of orbital excitations to spin fluctuations in Mott
  insulators   We show how the general and basic asymmetry between two fundamental degrees
of freedom present in strongly correlated oxides, spin and orbital, has very
profound repercussions on the elementary spin and orbital excitations. Whereas
the magnons remain largely unaffected, orbitons become inherently coupled with
spin fluctuations in spin-orbital models with antiferromagnetic and
ferroorbital ordered ground states. The composite orbiton-magnon modes that
emerge fractionalize again in one dimension, giving rise to spin-orbital
separation in the peculiar regime where spinons are faster than orbitons.

7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol