Propagating wave-packets and quantised currents in coherently driven polariton superfluids

Details Propagating wave-packets and quantised currents in coherently driven polariton superfluids Propagating wave-packets and quantised currents in coherently driven polariton superfluids

2010-05-25

arxiv.org/abs/1005.4625v1

Phys. Rev. Lett. 105, 236402 (2010)

Physics

Condensed Matter

Quantum Gases

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.236402

We study the properties of propagating polariton wave-packets and their connection to the stability of doubly charged vortices. Wave-packet propagation and related photoluminescence spectra exhibit a rich behaviour dependent on the excitation regime. We show that, because of the non-quadratic polariton dispersion, doubly charged vortices are stable only when initiated in wave-packets propagating at small velocities. Vortices propagating at larger velocities, or those imprinted directly into the polariton optical parametric oscillator (OPO) signal and idler are always unstable to splitting.

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