Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Stark many-body localization without disorder   Thermalization is a ubiquitous process of statistical physics, in which
details of few-body observables are washed out in favor of a featureless steady
state. Even in isolated quantum many-body systems, limited to reversible
dynamics, thermalization typically prevails. However, in these systems, there
is another possibility: many-body localization (MBL) can result in preservation
of a non-thermal state. While disorder has long been considered an essential
ingredient for this phenomenon, recent theoretical work has suggested that a
quantum many-body system with a uniformly increasing field -- but no disorder
-- can also exhibit MBL, resulting in `Stark MBL.' Here we realize Stark MBL in
a trapped-ion quantum simulator and demonstrate its key properties: halting of
thermalization and slow propagation of correlations. Tailoring the interactions
between ionic spins in an effective field gradient, we directly observe their
microscopic equilibration for a variety of initial states, and we apply
single-site control to measure correlations between separate regions of the
spin chain. Further, by engineering a varying gradient, we create a
disorder-free system with coexisting long-lived thermalized and nonthermal
regions. The results demonstrate the unexpected generality of MBL, with
implications about the fundamental requirements for thermalization and with
potential uses in engineering long-lived non-equilibrium quantum matter.

15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin