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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Topological Solitons Seminar: Spatial pattern formation in nonequilibrium condensates

Presented by Natalia Berloff, DAMTP, Cambridge

25 November 2009 16:15 in Ph30

Quasiparticles in semiconductors --- such as microcavity polaritons --- can form condensates in which the steady-state density profile is set by the balance of pumping and decay. We model trapped, pumped, decaying condensates by a complex Gross-Pitaevskii equation and analyse the density and currents in the steady state. If the pumping spot is larger than the Thomas-Fermi cloud radius, then rotationally symmetric solutions are replaced by solutions with spontaneous arrays of vortices. These vortex arrays arise without any rotation of the trap, spontaneously breaking rotational symmetry. By taking account of the polarization degree of freedom for such condensates, and considering the effects of an applied magnetic field, I will discuss the interplay between polarization dynamics, and the spatial structure of the pumped decaying condensate.

This seminar is organised by the atomic physics group, but members of the topological solitons group will attend.

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