Kármán vortex street in Bose-Einstein condensate with PT symmetric potential  

作　　者：Kaihua Shao Baolong Xi Zhonghong Xi Pu Tu Jinping Ma Xi Zhao Hongjuan Meng Yuren Shi 

机构地区：[1]College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou,730070,China [2]College of Physics and Hydropower Engineering,Gansu Normal College For Nationalities,Hezuo 747000,China [3]College of Intelligent Manufacturing,Sichuan University of Arts and Science,DaZhou,635000,China

出　　处：《Communications in Theoretical Physics》2025年第3期165-173,共9页理论物理通讯(英文版)

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.12065022,12147213。

摘　　要：Kármán vortex street not only exists in nature,but also widely appears in engineering practice,which is of great significance for understanding superfluid.Parity-time(PT)symmetric potential provides a good platform for the study of Kármán vortex streets.In this paper,different patterns of vortex shedding formed behind PT symmetric potential in Bose-Einstein condensate(BEC)are simulated numerically.Kármán vortex streets and others are discovered to emerge in the wake of a moving obstacle with appropriate parameters.Compared with BEC without PT symmetric potential,the frequency and amplitude of the drag force are more complex.The parametric regions of the combined modes are scattered around the Kármán vortex street.Numerical simulations indicate that the imaginary part of the PT symmetric potential affects the vortex structure patterns.Finally,we proposed an experimental protocol that may observe a Kármán vortex street.

关 键 词：Karman vortex street Bose-Einstein condensate PT symmetric potential 

分 类 号：O469[理学—凝聚态物理]