Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical thermalization of a disordered dipolar spin system in diamond   Statistical mechanics underlies our understanding of macroscopic quantum
systems. It is based on the assumption that out-of-equilibrium systems rapidly
approach their equilibrium states, forgetting any information about their
microscopic initial conditions. This fundamental paradigm is challenged by
disordered systems, in which a slowdown or even absence of thermalization is
expected. We report the observation of critical thermalization in a three
dimensional ensemble of $\sim 10^6$ electronic spins coupled via dipolar
interactions. By controlling the spin states of nitrogen vacancy color centers
in diamond, we observe slow, sub-exponential relaxation dynamics and identify a
regime of power-law decay with disorder-dependent exponents; this behavior is
modified at late times owing to many-body interactions. These observations are
quantitatively explained by a resonance counting theory that incorporates the
effects of both disorder and interactions.

8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th