Super-ballistic diffusion in a quasi-periodic non-Hermitian driven system with nonlinear interaction  

作　　者：李建政 李观玲 赵文垒 Jian-Zheng Li;Guan-Ling Li;Wen-Lei Zhao(School of Science,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]School of Science,Jiangxi University of Science and Technology,Ganzhou 341000,China

出　　处：《Chinese Physics B》2023年第9期386-390,共5页中国物理B（英文版）

基　　金：the Science and Technology Research Program of Jiangxi Education Department(Grant No.GJJ190463);the Doctoral Startup Fund of Jiangxi University of Science and Technology(Grant No.205200100067);supported by the National Natural Science Foundation of China(Grant No.12065009);the Natural Science Foundation of Jiangxi Province(Grant Nos.20224ACB201006 and 20224BAB201023);the Science and Technology Planning Project of Ganzhou City(Grant No.202101095077)。

摘　　要：We investigate the effects of nonlinear interactions on quantum diffusion in a quasi-periodic quantum kicked rotor system,featuring a non-Hermitian kicking potential.Remarkably,when the non-Hermitian driving strength is sufficiently strong,the energy diffusion follows a power law of time,characterized by an exponent that decreases monotonically with increasing the strength of nonlinear interactions.This demonstrates the emergence of super-ballistic diffusion(SBD).We find a distinct prethermalization stage in the time domain preceding the onset of SBD.The unique quantum diffusion phenomena observed in this chaotic system can be attributed to the decoherence effects generated by the interplay between nonlinear interactions and the non-Hermitian kicking potential.

关 键 词：super-ballistic diffusion Bose-Einstein condensate nonlinear interaction non-Hermiticity 

分 类 号：O469[理学—凝聚态物理]