Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Confinement of skyrmion states in non-centrosymmetric magnets near
  ordering temperatures   I consider skyrmionic states in non-centrosymmetric magnets near the ordering
temperatures. I show that the interaction between the chiral skyrmions, being
repulsive in a broad temperature range, changes into attraction at high
temperatures. This leads to a remarkable confinement effect: near the ordering
temperature skyrmions exist only as bound states. The confined skyrmions as
discernible units may arrange in different mesophases. The confinement of
multiple skyrmions is a consequence of the coupling between the magnitude and
the angular part of the order parameter. Thus, near the ordering transitions, I
consider the local magnetization not only as multiply twisted but also
longitudinally modulated. From numerical investigations on 2D models of
isotropic chiral ferromagnets, a staggered half-skyrmion square lattice at zero
and low fields and a hexagonal skyrmion lattice at larger fields are found in
overlapping regions of the phase diagram near the transition temperature. The
creation of skyrmions as stable units and their condensation into different
extended textures occurs simultaneously through a rare case of an
instability-type nucleation transition1. As well, I introduce a new fundamental
parameter, confinement temperature separating the peculiar region with
"confined" chiral modulations from the main part of the phase diagram with
regular helical and skyrmion states.

30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th