# Role of Wake Potential on Self-diffusion of Dust Particles in Dissipative System

## TL;DR

This study investigates how wake potential influences the self-diffusion of dust particles in complex plasma, revealing that ion flow significantly alters diffusion behavior depending on the dominant potential regime.

## Contribution

It introduces a Langevin dynamics simulation approach to analyze dust self-diffusion considering wake potential effects in subsonic ion flow regimes.

## Key findings

- Self-diffusion is strongly affected by ion flow.
- Diffusion behavior changes between wake potential and Debye-Hückel regimes.
- Dependence of diffusion coefficient on pressure, dust size, and ion velocity was quantified.

## Abstract

In this paper, the structural property of complex plasma and self-diffusion coefficient of dust particles in presence of such wake potential have been investigated using Langevin dynamics simulation in the subsonic regime of ion flow. The study reveals that the self-diffusion of dust grains is strongly affected by ion flow and it changes its character in the wake potential dominant to the Debye-H\"uckel potential dominant regimes. The dependence of self-diffusion coefficient on parameters such as neutral pressure, dust size, ion flow velocity, Coulomb coupling parameter have been calculated for subsonic regime using Green-Kubo expression which is based on integrated velocity autocorrelation function (VACF).