Topological Plasma Transport from a Diffusion View  

作　　者：刘周费 黄吉平 Zhoufei Liu;Jiping Huang(Department of Physics,State Key Laboratory of Surface Physics,and Key Laboratory of Micro and Nano Photonic Structures(MOE),Fudan University,Shanghai 200438,China)

机构地区：[1]Department of Physics,State Key Laboratory of Surface Physics,and Key Laboratory of Micro and Nano Photonic Structures(MOE),Fudan University,Shanghai 200438,China

出　　处：《Chinese Physics Letters》2023年第11期25-30,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12035004 and 12320101004);the Science and Technology Commission of Shanghai Municipality(Grant No.20JC1414700);the Innovation Program of Shanghai Municipal Education Commission(Grant No.2023ZKZD06)。

摘　　要：Recent studies have identified plasma as a topological material.Yet,these researches often depict plasma as a fluid governed by electromagnetic fields,i.e.,a classical wave system.Indeed,plasma transport can be characterized by a unique diffusion process distinguished by its collective behaviors.We adopt a simplified diffusion-migration method to elucidate the topological plasma transport.Drawing parallels to the thermal conduction-convection system,we introduce a double-ring model to investigate the plasma density behaviors in the anti-parity-time reversal(APT) unbroken and broken phases.Subsequently,by augmenting the number of rings,we have established a coupled ring chain structure.This structure serves as a medium for realizing the APT symmetric one-dimensional(1D) reciprocal model,representing the simplest tight-binding model with a trivial topology.To develop a model featuring topological properties,we should modify the APT symmetric 1D reciprocal model from the following two aspects:hopping amplitude and onsite potential.From the hopping amplitude,we incorporate the non-reciprocity to facilitate the non-Hermitian skin effect,an intrinsic non-Hermitian topology.Meanwhile,from the onsite potential,the quasiperiodic modulation has been adopted onto the APT symmetric 1D reciprocal model.This APT symmetric 1D Aubry–André–Harper model is of topological nature.Additionally,we suggest the potential applications for these diffusive plasma topological states.This study establishes a diffusion-based approach to realize topological states in plasma,potentially inspiring further advancements in plasma physics.

关 键 词：STRUCTURE TOPOLOGICAL reciprocal 

分 类 号：O441.4[理学—电磁学] O53[理学—物理]