Supersonic flow of a Bose-Einstein condensate past an oscillating attractive-repulsive obstacle

2012/12/22 by E. G. Khamis, Eduardo G. Khamis, A. Gammal +1
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum Electrodynamics and Casimir Effect #Strong Light-Matter Interactions #cond-mat.quant-gas #nlin.PS

paper · pdf · doi:10.1103/physreva.87.045601

published as Phys. Rev. A 87, 045601 (2013) · 8 pages, 13 figures

arxiv created 2012/12/22 · openalex publication_date 2013/04/01 · arxiv updated 2013/04/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate by numerical simulations the pattern formation after an oscillating attractive-repulsive obstacle inserted into the flow of a Bose-Einstein condensate. For slow oscillations we observe a complex emission of vortex dipoles. For moderate oscillations organized lined up vortex dipoles are emitted. For high frequencies no dipoles are observed but only lined up dark fragments. The results shows that the drag force turns negative for sufficiently high frequency. We also successfully model the ship waves in front of the obstacle. In the limit of very fast oscillations all the excitations of the system tend to vanish.

Citations

• Bose–Einstein condensation of exciton polaritons
• Highly anisotropic Bose-Einstein condensates: Crossover to lower dimensionality
• Dissipation and vortex creation in Bose-Einstein condensed gases
• Radiation of linear waves in the stationary flow of a Bose-Einstein condensate past an obstacle
• Nonlinear diffraction of light beams propagating in photorefractive media with embedded reflecting wire