Phase Transition in Dust Clusters with Different Charging Processes

Abstract

Random charging processes effects on ground-state configurations and phase transition of a finite system have been investigated in terms of Hamiltonian system. The particles interact through a screened Yukawa potential and are confined by a two-dimensional parabolic potential. Numerical simulation was performed at low temperature for charging processes by particles collection and by photoemission. Results show that the charge fluctuation changes significantly the ground-state configurations only in the case of the photoemission charging process and give rise to a change on the melting characteristics.

Melting of strongly coupled, negatively charged, two‐dimensional dust cluster: The role of charge fluctuation amplitude

“…[19][20][21][22][23][24][25][26][27][28][29][30][31][32] In 1994, Cui and Goree developed a model devoted to finding the charge variation using Monte Carlo methods by using only the primary charging currents. [35][36][37] An important characteristic, making dust very different from ions, is that the charge is not a fixed quantity. Matsoukas et al examined the fluctuations as a Markov process.…”

“…[32] Other models may be used to explain diverse phenomena, especially in dust acoustic surface plasma waves, [33] shock waves, [34] and strongly coupled plasmas. The charge fluctuation changes the ground-state configuration significantly only in the case of the photoemission charging process and gives rise to a change in the melting characteristics 37 . For nanometre-sized dust of a complex plasma produced by heated RF, they can find their energy increased by up to several eV due to random charge fluctuation.…”

“…[32] Other models may be used to explain diverse phenomena, especially in dust acoustic surface plasma waves, [33] shock waves, [34] and strongly coupled plasmas. [35][36][37] An important characteristic, making dust very different from ions, is that the charge is not a fixed quantity. For nanometre-sized dust of a complex plasma produced by heated RF, they can find their energy increased by up to several eV due to random charge fluctuation.…”

“…As a consequence of charge fluctuations, the critical eccentricity parameter corresponding to the transition from a zigzag configuration to a linear chain, for an ensemble of dust cluster confined in elliptical confinement, has a smaller value than that of a dust ensemble with constant charge 36 . The charge fluctuation changes the ground-state configuration significantly only in the case of the photoemission charging process and gives rise to a change in the melting characteristics 37 .…”