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dc.contributor.authorBowick, Mark
dc.date.accessioned2018-05-18T18:39:03Z
dc.date.available2018-05-18T18:39:03Z
dc.date.issued2018-04-18
dc.identifier.urihttp://hdl.handle.net/1853/59691
dc.descriptionPresented at the Symposium on Soft Matter Forefronts, April 18, 2018, from 9:40 a.m.-10:20 a.m. at the Georgia Tech Student Center Theater.en_US
dc.descriptionChairs: Gabi Steinbach and Peter Yunker (Georgia Tech).en_US
dc.descriptionMark Bowick is with the Kavli Institute for Theoretical Physics, University of California, Santa Barbara.en_US
dc.descriptionRuntime: 41:56 minutesen_US
dc.description.abstractActive flocking on curved surfaces, such as the 2-sphere and the catenoid, exhibits dynamical symmetry breaking in the form of spontaneous flow, calculable inhomogeneous density patterns and long-wavelength propagating sound modes that get gapped by the curvature of the underlying substrate. Curvature and active flow together result in symmetry-protected topological modes that get localized to special geodesics on the surface. These modes are the analogue of edge states in electronic quantum Hall systems and provide unidirectional channels for information transport in the flock, robust against disorder and backscattering. Active nematics instead exhibit spontaneous motility of strength +1/2 disclinations and active torques that favor the motility-driven unbinding of defects. Despite the directed motion of defects, nematic order is stabilized by rotational noise at low enough activity. Within a perturbative treatment, active forces lower the effective defect-unbinding transition temperature.en_US
dc.description.sponsorshipGeorgia Institute of Technology. College of Sciencesen_US
dc.description.sponsorshipGeorgia Institute of Technology. Institute for Materialsen_US
dc.description.sponsorshipGeorgia Institute of Technology. Parker H. Petit Institute for Bioengineering and Bioscienceen_US
dc.description.sponsorshipGeorgia Institute of Technology. School of Materials Science and Engineeringen_US
dc.description.sponsorshipGeorgia Institute of Technology. School of Physicsen_US
dc.description.sponsorshipAmerican Physical Societyen_US
dc.description.sponsorshipExxon Mobil Corporationen_US
dc.description.sponsorshipNational Science Foundation (U.S.)en_US
dc.format.extent41:56 minutes
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectActive flowen_US
dc.subjectCurvatureen_US
dc.subjectSoft matteren_US
dc.titleTopology in Polar Flocking and Active Nematicsen_US
dc.title.alternativeFlocking Round and Rounden_US
dc.typePresentationen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfacesen_US
dc.contributor.corporatenameUniversity of California, Santa Barbaraen_US
dc.contributor.corporatenameKavli Institute for Theoretical Physicsen_US


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