TY - JOUR
T1 - Organizing bacterial vortex lattices by periodic obstacle arrays
AU - Reinken, Henning
AU - Nishiguchi, Daiki
AU - Heidenreich, Sebastian
AU - Sokolov, Andrey
AU - Bär, Markus
AU - Klapp, Sabine H.L.
AU - Aranson, Igor S.
N1 - Funding Information:
The authors thank Gil Ariel, Bernold Fiedler, Fernando Peruani, and Michael Wilczek for fruitful discussions. This work was funded by the Deutsche For-schungs-ge-mein-schaft (DFG, German Research Foundation)—Projektnummer 163436311—SFB 910. The research of I.S.A. was supported by the NSF PHY-1707900. S.H. and M.B. acknowledge financial support by DFG through the Middle-East program via combined grants (BA 1222/7-1 and HE 5995/3-1). D.N. was supported by JSPS KAKENHI Grant Numbers JP19K23422, JP19H05800 and JP20K14426. A.S. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - Recent experiments have shown that the complex spatio-temporal vortex structures emerging in active fluids are susceptible to weak geometrical constraints. This observation poses the fundamental question of how boundary effects stabilize a highly ordered pattern from seemingly turbulent motion. Here we show, by a combination of continuum theory and experiments on a bacterial suspension, how artificial obstacles guide the flow profile and reorganize topological defects, which enables the design of bacterial vortex lattices with tunable properties. To this end, the continuum model is extended by appropriate boundary conditions. Beyond the stabilization of square and hexagonal lattices, we also provide a striking example of a chiral, antiferromagnetic lattice exhibiting a net rotational flow, which is induced by arranging the obstacles in a Kagome-like array.
AB - Recent experiments have shown that the complex spatio-temporal vortex structures emerging in active fluids are susceptible to weak geometrical constraints. This observation poses the fundamental question of how boundary effects stabilize a highly ordered pattern from seemingly turbulent motion. Here we show, by a combination of continuum theory and experiments on a bacterial suspension, how artificial obstacles guide the flow profile and reorganize topological defects, which enables the design of bacterial vortex lattices with tunable properties. To this end, the continuum model is extended by appropriate boundary conditions. Beyond the stabilization of square and hexagonal lattices, we also provide a striking example of a chiral, antiferromagnetic lattice exhibiting a net rotational flow, which is induced by arranging the obstacles in a Kagome-like array.
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U2 - 10.1038/s42005-020-0337-z
DO - 10.1038/s42005-020-0337-z
M3 - Article
AN - SCOPUS:85085080153
SN - 2399-3650
VL - 3
JO - Communications Physics
JF - Communications Physics
IS - 1
M1 - 76
ER -