Modelling of Voids in Complex Radio Frequency Plasmas

Strong correlations-cooperative behavior due to many-particle interactions-are omnipresent in nature. They occur in electrolytic solutions, dense plasmas, ultracold ions and atomic gases in traps, complex (dusty) plasmas, electrons and excitons in quantum dots and the quark-gluon plasma. Correlation effects include the emergence of long-range order, of liquid-like or crystalline structures and collective dynamic properties (collective modes). The observation and experimental analysis of strong correlations are often difficult, requiring, in many cases, extreme conditions such as very low temperatures or high densities. An exception is complex plasmas where strong coupling can be easily achieved, even at room temperature. These systems feature the strongest correlations reported so far and experiments allow for an unprecedented precision and full single-particle resolution of the stationary and time-dependent many-particle behavior. The governing role of the interactions in strongly correlated systems gives rise to many universal properties observed in all of them. This makes the analysis of one particular system interesting for many others. This motivates the goal of this paper which is to give an overview on recent experimental and theoretical results in complex plasmas including liquid-like behavior, crystal formation, structural and dynamic properties. It is expected that many of these effects will be of interest also to researchers in other fields where strong correlations play a prominent role.

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“…Therefore, instead of simulating the complex plasma exactly it is possible to develop hybrid concepts (see e.g. [217] and references therein).…”

Section: Theoretical Modelsmentioning

confidence: 99%

Complex plasmas: a laboratory for strong correlations

2010

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“…We calculate the ion drag force F id using the same approach as Goedheer et al [88], namely by incorporating results from previous studies by Khrapak et al [89], Ivlev et al [90], and Hutchinson [24]:…”

Section: Molecular Dynamics Model Of the Microparticlesmentioning

confidence: 99%

Simulating the dynamics of complex plasmas

Schwabe

Graves

2013

Phys. Rev. E

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Complex plasmas are low temperature plasmas that contain micrometer-sized particles in addition to the neutral gas particles and the ions and electrons that make up the plasma. The microparticles interact strongly and display a wealth of collective effects. Here, we report on linked numerical simulations that reproduce many of the experimental results of complex plasmas. We model a capacitively coupled plasma with a fluid code written for the commercial package COMSOL. The output of this model is used to calculate forces on microparticles. The microparticles are modeled using the molecular dynamics package LAMMPS, which we extended to include the forces from the plasma. Using this method, we are able to reproduce void formation, the separation of particles of different sizes into layers, lane formation, vortex formation and other effects.

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“…7 (2) The ion drag force, acting on microparticles, becomes important, leading to the formation of socalled voids, i.e., microparticle-free regions. [8][9][10][11][12][13][14] Such plasmas can no longer be treated as homogeneous.…”

Section: Introductionmentioning

confidence: 99%

On the heterogeneous character of the heartbeat instability in complex (dusty) plasmas

et al. 2012

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International audienceA hypothesis on the physical mechanism generating the heartbeat instability in complex (dusty) plasmas is presented. It is suggested that the instability occurs due to the periodically repeated critical transformation on the boundary between the microparticle-free area (void) and the complex plasma. The critical transformation is supposed to be analogous to the formation of the sheath in the vicinity of an electrode. The origin of the transformation is the loss of the electrons and ions on microparticles surrounding the void. We have shown that this hypothesis is consistent with the experimentally measured stability parameter range, with the evolution of the plasma glow intensity and microparticle dynamics during the instability, as well as with the observed excitation of the heartbeat instability by an intensity-modulated laser beam (inducing the modulation of plasma density)

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Modelling of Voids in Complex Radio Frequency Plasmas

Cited by 16 publications

References 45 publications

Complex plasmas: a laboratory for strong correlations

Complex plasmas: a laboratory for strong correlations

Simulating the dynamics of complex plasmas

On the heterogeneous character of the heartbeat instability in complex (dusty) plasmas

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