Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental observation of a phase transition in the evolution of
  many-body systems with dipolar interactions   Non-equilibrium dynamics of many-body systems is important in many branches
of science, such as condensed matter, quantum chemistry, and ultracold atoms.
Here we report the experimental observation of a phase transition of the
quantum coherent dynamics of a 3D many-spin system with dipolar interactions,
and determine its critical exponents. Using nuclear magnetic resonance (NMR) on
a solid-state system of spins at room-temperature, we quench the interaction
Hamiltonian to drive the evolution of the system. The resulting dynamics of the
system coherence can be localized or extended, depending on the quench
strength. Applying a finite-time scaling analysis to the observed
time-evolution of the number of correlated spins, we extract the critical
exponents v = s = 0.42 around the phase transition separating a localized from
a delocalized dynamical regime. These results show clearly that such
nuclear-spin based quantum simulations can effectively model the
non-equilibrium dynamics of complex many-body systems, such as 3D spin-networks
with dipolar interactions.

11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph