【报告题目】Topological transition from superfluid vortex rings to isolated knots and links

【报告人】杨涛 教授，西北大学

【报告时间】2020.11.25 (周三) 下午 14:00

【地点】科技楼, 29#-414

【摘要】Knots and links are fundamental topological objects play a key role in both classical and quantum fluids. In this research, we propose a scheme to generate torus vortex knots and links through the reconnections of vortex rings perturbed by Kelvin waves in trapped Bose-Einstein condensates, which makes it possible to generate topologically complex structures from topologically trivial objects controllably. The transfer of helicity between knots/links and coils occur with different pathways which can be controlled through designing specific initial states. The generation of a knot or link can be achieved by setting the parity of the Kelvin wave number. The stability of knots/links can be improved greatly with tunable parameters, including the ideal relative angle and the minimal distance between the initial vortex rings.

【邀请人】高先龙 教授

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