Topological structure and dynamics of three-dimensional active nematics

被引：155

作者：

Duclos, Guillaume ^{[1
]}

Adkins, Raymond ^{[2
]}

Banerjee, Debarghya ^{[3
,4
]}

Peterson, Matthew S. E. ^{[1
]}

Varghese, Minu ^{[1
]}

Kolvin, Itamar ^{[2
]}

Baskaran, Arvind ^{[1
]}

Pelcovits, Robert A. ^{[5
]}

Powers, Thomas R. ^{[5
,6
]}

Baskaran, Aparna ^{[1
]}

Toschi, Federico ^{[7
,8
]}

Hagan, Michael F. ^{[1
]}

Streichan, Sebastian J. ^{[2
]}

Vitelli, Vincenzo ^{[9
,10
]}

Beller, Daniel A. ^{[11
]}

Dogic, Zvonimir ^{[1
,2
]}

机构：

[1] Brandeis Univ, Dept Phys, Waltham, MA 02453 USA

[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93111 USA

[3] Max Planck Inst Dynam & Self Org, D-37077 Gottingen, Germany

[4] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[5] Brown Univ, Dept Phys, Providence, RI 02912 USA

[6] Brown Univ, Sch Engn, Providence, RI 02912 USA

[7] Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands

[8] CNR, Inst Applicaz Calcolo, I-00185 Rome, Italy

[9] Univ Chicago, James Franck Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA

[10] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[11] Univ Calif, Dept Phys, Merced, CA 95343 USA

来源：

SCIENCE | 2020年 / 367卷 / 6482期

基金：

英国工程与自然科学研究理事会;

关键词：

DISCLINATION LOOPS; DEFECTS;

D O I：

10.1126/science.aaz4547

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Topological structures are effective descriptors of the nonequilibrium dynamics of diverse many-body systems. For example, motile, point-like topological defects capture the salient features of two-dimensional active liquid crystals composed of energy-consuming anisotropic units. We dispersed force-generating microtubule bundles in a passive colloidal liquid crystal to form a three-dimensional active nematic. Light-sheet microscopy revealed the temporal evolution of the millimeter-scale structure of these active nematics with single-bundle resolution. The primary topological excitations are extended, charge-neutral disclination loops that undergo complex dynamics and recombination events. Our work suggests a framework for analyzing the nonequilibrium dynamics of bulk anisotropic systems as diverse as driven complex fluids, active metamaterials, biological tissues, and collections of robots or organisms.

引用

页码：1120 / +

页数：33

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