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北京工业大学高能组

Dissipation-induced ring dark solitons and vortex pairs in BEC

by Mr 陈 波

Asia/Shanghai
318 (数理楼)

318

数理楼

Description

Dissipative potential can induce phase jumps and density defects in the system. In this paper, we propose a new method to induce the generation of ring dark solitons by adding a local dissipative potential. We investigate the ring dark solitons generation for various dissipation widths and dissipation strengths as well as ring dark solitons production by varying the parameters. We discover that the system evolves in a manner that is strikingly similar to that of a dissipation-free system when the dissipation strength is low (γ= 0.001). In this case, no ring dark solitons are excited. The ring dark solitons generated in the system is unstable when the dissipation strength is slightly higher (γ=0.015), and it evolves for an only while before cleaving. Increased dissipation strength can inhibits this effect, the ring dark solitons are very stable when γ=15 and γ=1500. The dissipation induces the generation of ring oscillations in addition to the formation of ring dark solitons. Although increasing dissipation strength causes oscillation excitation, increasing dissipation width lessens oscillation excitation. The density defect will be broader and the induced oscillations will be weaker when the dissipation width value is increased. Finally, we investigate the ring dark solitons generation after quenching. Ring dark solitons splits into several new concentric ring dark solitons after an abrupt cessation of dissipation(also known as quenching). The number of solitons generated after cleavage increases with the size of the density defect before quenching, and these solitons have the same width.