Numerical Approach to Dynamical Structure Factor of Dusty Plasmas

Abstract

The dynamical structure factor [S(k,ω)] gives the information about static and dynamic properties of complex dusty plasma (CDPs). We have used the equilibrium molecular dynamic (EMD) simulations for the investigation of S(k,ω) of strongly coupled CDPs (SCCDPs). In this work, we have computed all possible values of dynamical density with increasing and decreasing sequences of plasma frequency (ω p) and wave number (k) over a wide range of different combinations of the plasma parameters (κ, Γ). Our new simulation results show that the fluctuation of S(k,ω) increases with increasing Г and it decreases with an increase of κ and N. Moreover, investigation shows that the amplitude of S(k,ω) increases by increasing screening (κ) and wave number (k), and it decreases with increasing Г. Our EMD simulation shows that dynamical density of SCCDPs is slightly dependent on N; however, it is nearly independent of other parameters. The presented results obtained through EMD approach are in reasonable agreement with earlier known results based on different numerical methods and plasma states. It is demonstrated that the presented model is the best tool for estimating the density fluctuation in the SCCDPs over a suitable range of parameters.

Structural Analysis of Strongly Coupled Dusty Plasma using Molecular Dynamics Simulation

“…( 2), T is absolute temperature, k B is Boltzmann constant and a ws represents Wigner Seitz (ws) radius and its value is (3/4πn) 1/3 with n representing the number density (n = N/V) of dust particle. Debye screening strength is the ratio of the interparticle distance a (Wigner Seitz radius) to the Debye length λ D [1,5,8]. The value of κ can be represented in this form:…”

“…The research from the last analysis has shown that these dust particles are fine particles. The present condition (2000-2017) of DP is stable and is playing a very dominant role in science, industries, technology, energy sectors, and medical stores [8].…”