Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Persistence of power-law correlations in nonequilibrium steady states of
  gapped quantum spin chains   The existence of quasi-long range order is demonstrated in nonequilibrium
steady states in isotropic $XY$ spin chains including of two types of
additional terms that each generate a gap in the energy spectrum. The system is
driven out of equilibrium by initializing a domain-wall magnetization profile
through application of an external magnetic field and switching off the
magnetic field at the same time the energy gap is activated. An energy gap is
produced by either applying a staggered magnetic field in the $z$ direction or
introducing a modulation to the $XY$ coupling. The magnetization, spin current,
and spin-spin correlation functions are computed analytically in the
thermodynamic limit at long times after the quench. For both types of systems,
we find the persistence of power-law correlations despite the ground-state
correlation functions exhibiting exponential decay.

36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
17
The categories of this paper are: q-fin