Publication:
Ferromagnetic and antiferromagnetic order in bacterial vortex lattices

dc.contributor.author Wioland, Hugo
dc.contributor.author Woodhouse, Francis Gordon
dc.contributor.author Dunkel, J├╢rn
dc.contributor.author Goldstein, Raymond
dc.date.accessioned 2019-04-26T08:56:55Z
dc.date.available 2019-04-26T08:56:55Z
dc.date.issued 04/01/16
dc.description Despite their inherently non-equilibrium nature [1] , living systems can self-organize in highly ordered collective states [2,3] that share striking similarities with the thermodynamic equilibrium phases [4,5] of conventional condensed-matter and fluid systems. Examples range from the liquid-crystal-like arrangements of bacterial colonies [6,7], microbial suspensions [8,9] and tissues [10] to the coherent macro-scale dynamics in schools of fish [11] and flocks of birds [12]. Yet, the generic mathematical principles that govern the emergence of structure in such artificial [13] and biological [6ΓÇô9,14] systems are elusive. It is not clear when, or even whether, well-established theoretical concepts describing universal thermostatistics of equilibrium systems can capture and classify ordered states of living matter. Here, we connect these two previously disparate regimes: through microfluidic experiments and mathematical modelling, we demonstrate that lattices of hydrodynamically coupled bacterial vortices can spontaneously organize into distinct patterns characterized by ferro- and antiferromagnetic order. The coupling between adjacent vortices can be controlled by tuning the inter-cavity gap widths. The emergence of opposing order regimes is tightly linked to the existence of geometry-induced edge currents [15,16], reminiscent of those in quantum systems [17ΓÇô19]. Our experimental observations can be rationalized in terms of a generic lattice field theory, suggesting that bacterial spin networks belong to the same universality class as a wide range of equilibrium systems.
dc.identifier.uri https://demo7.dspace.org/handle/10673/436
dc.language en
dc.publisher Nature Publishing Group
dc.title Ferromagnetic and antiferromagnetic order in bacterial vortex lattices
dspace.entity.type Publication
relation.isAuthorOfPublication 9549540f-5043-469c-b668-703dd5e706d5
relation.isAuthorOfPublication cde1cf3d-12eb-4e96-872b-42b18565f5da
relation.isProjectOfPublication c3594020-df0a-4574-a2a2-a751a0bf9534
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