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Article Dans Une Revue Physical Review Letters Année : 2015

Comment on "Linear wave dynamics explains observations attributed to dark-solitons in a polariton quantum fluid"

Résumé

In a recent preprint (arXiv:1401.1128v1) Cilibrizzi and co-workers report experiments and simulations showing the scattering of polaritons against a localised obstacle in a semiconductor microcavity. The authors observe in the linear excitation regime the formation of density and phase patterns reminiscent of those expected in the non-linear regime from the nucleation of dark solitons. Based on this observation, they conclude that previous theoretical and experimental reports on dark solitons in a polariton system should be revised. Here we comment why the results from Cilibrizzi et al. take place in a very different regime than previous investigations on dark soliton nucleation and do not reproduce all the signatures of its rich nonlinear phenomenology. First of all, Cilibrizzi et al. consider a particular type of radial excitation that strongly determines the observed patterns, while in previous reports the excitation has a plane-wave profile. Most importantly, the nonlinear relation between phase jump, soliton width and fluid velocity, and the existence of a critical velocity with the time-dependent formation of vortex-antivortex pairs are absent in the linear regime. In previous reports about dark soliton and half-dark soliton nucleation in a polariton fluid, the distinctive dark soliton physics is supported both by theory (analytical and numerical) and experiments (both continuous wave and pulsed excitation).

Dates et versions

hal-01203560 , version 1 (23-09-2015)

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Citer

A. Amo, J. Bloch, A. Bramati, I. Carusotto, C. Ciuti, et al.. Comment on "Linear wave dynamics explains observations attributed to dark-solitons in a polariton quantum fluid". Physical Review Letters, 2015, 115, pp.089401. ⟨10.1103/PhysRevLett.115.089401⟩. ⟨hal-01203560⟩
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