Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uncovering the non-equilibrium phase structure of an open quantum spin
  system   We experimentally and theoretically investigate the non-equilibrium phase
structure of a well-controlled driven-disspative quantum spin system governed
by the interplay of coherent driving, spontaneous decay and long-range
spin-spin interactions. We discover that the rate of population loss provides a
convenient macroscopic observable that exhibits power-law scaling with the
driving strength over several orders of magnitude. The measured scaling
exponents reflect the underlying non-equilibrium phase structure of the
many-body system, which includes dissipation-dominated, paramagnetic and
critical regimes as well as an instability which drives the system towards
states with high excitation density. This opens up a new means to study and
classify quantum systems out of equilibrium and extends the domain where
scale-invariant behavior may be found in nature.

7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph