Flocks on a Sphere Sound Topological!

Shankar, Suraj

Title:

Flocks on a Sphere Sound Topological!

dc.contributor.author	Shankar, Suraj
dc.contributor.corporatename	Georgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfaces	en_US
dc.contributor.corporatename	Syracuse University	en_US
dc.date.accessioned	2018-06-27T20:11:29Z
dc.date.available	2018-06-27T20:11:29Z
dc.date.issued	2018-05-14
dc.description	Presented 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.description	Chairs: Phillip First and Zhigang Jiang	en_US
dc.description	Suraj Shankar is with Syracuse University.	en_US
dc.description	Runtime: 35:23 minutes	en_US
dc.description.abstract	Flocking, 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.extent	35:23 minutes
dc.identifier.uri	http://hdl.handle.net/1853/60041
dc.language.iso	en_US	en_US
dc.publisher	Georgia Institute of Technology	en_US
dc.relation.ispartofseries	Workshop on Topological Protection in Messy Matter	en_US
dc.subject	Curved surfaces	en_US
dc.subject	Sound modes	en_US
dc.subject	Topology	en_US
dc.title	Flocks on a Sphere Sound Topological!	en_US
dc.type	Moving Image
dc.type.genre	Lecture
dspace.entity.type	Publication
local.contributor.corporatename	Community for Research on Active Surfaces and Interfaces
local.contributor.corporatename	Center for the Science and Technology of Advanced Materials and Interfaces
relation.isOrgUnitOfPublication	f64aedb3-a547-444f-954c-827086175f37
relation.isOrgUnitOfPublication	a21b130a-9b72-4c0c-b82d-22f981aa1d12