Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cluster formation via sonic depletion forces in levitated granular
  matter   The properties of small clusters can differ dramatically from the bulk phases
of the same constituents. In equilibrium, cluster assembly has been recently
explored, whereas out of equilibrium, the physical principles of clustering
remain elusive. These principles underlie phenomena from molecular assembly to
the formation of planets from granular matter. Here, we introduce acoustic
levitation as a platform to experimentally probe the formation of
nonequilibrium small structures in a controlled environment. We focus on the
minimal models of cluster formation: six and seven millimetre-scale particles
in two dimensions. Experiments and modelling reveal that, in contrast to
thermal colloids, in non-equilibrium granular ensembles the magnitude of active
fluctuations controls not only the assembly rates but also their assembly
pathways and ground-state statistics. These results open up new possibilities
for non-invasively manipulating macroscopic particles, tuning their
interactions, and directing their assembly.

9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics