Abstract：
:The process of crystallization is difficult to observe for transported, out-of-equilibrium systems, as the continuous energy injection increases activity and competes with ordering. In emerging fields such as microfluidics and active matter, the formation of long-range order is often frustrated by the presence of hydrodynamics. Here we show that a population of colloidal rollers assembled by magnetic fields into large-scale propelling carpets can form perfect crystalline materials upon suitable balance between magnetism and hydrodynamics. We demonstrate a field-tunable annealing protocol based on a controlled colloidal flow above the carpet that enables complete crystallization after a few seconds of propulsion. The structural transition from a disordered to a crystalline carpet phase is captured via spatial and temporal correlation functions. Our findings unveil a novel pathway to magnetically anneal clusters of propelling particles, bridging driven systems with crystallization and freezing in material science.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Massana-Cid H,Meng F,Matsunaga D,Golestanian R,Tierno Pdoi
10.1038/s41467-019-10255-4subject
Has Abstractpub_date
2019-06-04 00:00:00pages
2444issue
1issn
2041-1723pii
10.1038/s41467-019-10255-4journal_volume
10pub_type
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