TY - JOUR
T1 - Chemotactic Motility-Induced Phase Separation
AU - Zhao, Hongbo
AU - Košmrlj, Andrej
AU - Datta, Sujit S.
N1 - Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/9/15
Y1 - 2023/9/15
N2 - Collectives of actively moving particles can spontaneously separate into dilute and dense phases - a fascinating phenomenon known as motility-induced phase separation (MIPS). MIPS is well-studied for randomly moving particles with no directional bias. However, many forms of active matter exhibit collective chemotaxis, directed motion along a chemical gradient that the constituent particles can generate themselves. Here, using theory and simulations, we demonstrate that collective chemotaxis strongly competes with MIPS - in some cases, arresting or completely suppressing phase separation, or in other cases, generating fundamentally new dynamic instabilities. We establish principles describing this competition, thereby helping to reveal and clarify the rich physics underlying active matter systems that perform chemotaxis, ranging from cells to robots.
AB - Collectives of actively moving particles can spontaneously separate into dilute and dense phases - a fascinating phenomenon known as motility-induced phase separation (MIPS). MIPS is well-studied for randomly moving particles with no directional bias. However, many forms of active matter exhibit collective chemotaxis, directed motion along a chemical gradient that the constituent particles can generate themselves. Here, using theory and simulations, we demonstrate that collective chemotaxis strongly competes with MIPS - in some cases, arresting or completely suppressing phase separation, or in other cases, generating fundamentally new dynamic instabilities. We establish principles describing this competition, thereby helping to reveal and clarify the rich physics underlying active matter systems that perform chemotaxis, ranging from cells to robots.
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U2 - 10.1103/PhysRevLett.131.118301
DO - 10.1103/PhysRevLett.131.118301
M3 - Article
C2 - 37774273
AN - SCOPUS:85172940397
SN - 0031-9007
VL - 131
JO - Physical review letters
JF - Physical review letters
IS - 11
M1 - 118301
ER -