Propagating wave-packets and quantised currents in coherently driven polariton superfluids
arXiv:1005.4625 · doi:10.1103/PhysRevLett.105.236402
Abstract
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.
5 pages, 4 figures
References in corpus (5)
- Observation of Superfluidity of Polaritons in Semiconductor Microcavities
- Quantum-fluid dynamics of microcavity polaritons
- Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
- Ultraslow propagation of matched pulses by four-wave mixing in an atomic vapor
- Spontaneous and triggered vortices in polariton OPO superfluids