Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous formation and relaxation of spin domains in
  antiferromagnetic spin-1 quasi-condensates   Quantum systems of many interacting particles at low temperatures generally
organize themselves into ordered phases of matter, whose nature and symmetries
are captured by an order parameter. In the simplest cases, this order parameter
is spatially uniform. For example, a system of localized spins with
ferromagnetic interactions align themselves to a common direction and build up
a macroscopic magnetization on large distances. However, non-uniform situations
also exist in nature, for instance in antiferromagnetism where the
magnetization alternates in space. The situation becomes even richer when the
spin-carrying particles are mobile, for instance in the so-called stripe phases
emerging for itinerant electrons in strongly-correlated materials.
Understanding such inhomogeneously ordered states is of central importance in
many-body physics. In this work, we study experimentally the magnetic ordering
of itinerant spin-1 bosons in inhomegeneous spin domains at nano-Kelvin
temperatures. We demonstrate that spin domains form spontaneously after a phase
separation transition, \textit{i.e.} in the absence of external magnetic force,
purely because of the antiferromagnetic interactions between the atoms.
Furthermore, we explore how the equilibrium domain configuration emerges from
an initial state prepared far-from-equilibrium.

10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg