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dc.contributor.authorShankar, Suraj
dc.date.accessioned2018-06-27T20:11:29Z
dc.date.available2018-06-27T20:11:29Z
dc.date.issued2018-05-14
dc.identifier.urihttp://hdl.handle.net/1853/60041
dc.descriptionPresented at the Workshop on Topological Protection in Messy Matter on May 14, 2018 at 4:00 p.m.-4:40 p.m. in the Marcus Nanotechnology Building, Rooms 1116-1118, Georgia Tech.en_US
dc.descriptionChairs: Phillip First and Zhigang Jiangen_US
dc.descriptionSuraj Shankar is with Syracuse University.en_US
dc.descriptionRuntime: 35:23 minutesen_US
dc.description.abstractFlocking, the self-organized and spontaneous motion of a large collection of self-propelled entities, is ubiquitous in the natural world. Such collective motion, for instance in groups of cells advancing en masse during growth and development, often happens on curved surfaces. Curvature frustrates orientational order and leads to inhomogeneous steady states, possibly with defects. Additionally, curvature also generates a gap in the spectrum of long-wavelength sound modes that are present in an ordered polar flock. The breaking of time reversal symmetry due to spontaneous flow and the presence of a spectral gap leads to topologically protected sound modes that propagate unidirectionally and are localized to special geodesics on the surface, like the equator on a sphere. Analogous to edge states in quantum Hall systems or well-known equatorial waves in atmospheric flows, these modes can provide robust channels for information transport in the flock immune to disorder and backscattering.en_US
dc.format.extent35:23 minutes
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesWorkshop on Topological Protection in Messy Matteren_US
dc.subjectCurved surfacesen_US
dc.subjectSound modesen_US
dc.subjectTopologyen_US
dc.titleFlocks on a Sphere Sound Topological!en_US
dc.typeLectureen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfacesen_US
dc.contributor.corporatenameSyracuse Universityen_US


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