Melting of a dust crystal with defects

Shveigert, I. V.; Shveigert, V. A.; Melzer, A.; Piel, A.

doi:10.1134/1.568279

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…A recent review on this topic was published by Shukla and Eliasson [181]. Furthermore, the detailed investigations of the solid-fluid phase transition are certainly a highlight of complex plasma research [182][183][184][185][186]. Recently, a growing interest in liquid complex plasmas has been noted.…”

Section: Dust Dynamicsmentioning

confidence: 99%

Complex plasmas: a laboratory for strong correlations

2010

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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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Section: Dust Dynamicsmentioning

confidence: 99%

Complex plasmas: a laboratory for strong correlations

2010

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“…As we mentioned earlier, the Schweigert instability is typically observed when an ion flow passes perpendicular to a layer of microspheres, and it is most profound if the microspheres in fact do not rest strictly in a single 2D plane, but instead have noticeably large out-of-plane displacements. 62,65,66,85 As the ions flow past a microparticle, they form a downstream wake, where there is a spatially localized concentration of positive space charge. That downstream wake can attract other microparticles, which are negatively charged.…”

Section: B Explaining How the Shock Can Decay Littlementioning

confidence: 99%

“…That downstream wake can attract other microparticles, which are negatively charged. This attraction to the ion wake can lead to a particularly strong energy transfer from the ion flow to the microparticles, 62,65,66,85 in what has been described as a nonreciprocal interaction. 2,63,64,66,78,85,86 Considerable kinetic energy can be added to microparticles, if they do not rest on a single plane, but instead have out-of-plane displacements.…”

Section: B Explaining How the Shock Can Decay Littlementioning

confidence: 99%

“…For a 2D cloud, instabilities driven by ion flow have been well studied experimentally and theoretically, and there is a theory for the Schweigert instability. [61][62][63][64][65][66] This is different from the ion-acoustic instability in a 3D cloud, which involves ion flow that is aligned with the direction that a wave propagates within a 3D volume.…”

Section: Introductionmentioning

confidence: 99%

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Shocks propagate in a 2D dusty plasma with less attenuation than that due to gas friction alone

Kananovich,

Goree

2020

Preprint

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In a dusty plasma, an impulsively generated shock, i.e., blast wave, was observed to decay less than would be expected due to gas friction alone. In the experiment, a single layer of microparticles was levitated in a radio-frequency glow-discharge plasma. In this layer, the microparticles were self-organized as a 2D solid-like strongly coupled plasma, which was perturbed by the piston-like mechanical movement of a wire. To excite a blast wave, the wire's motion was abruptly stopped, so that the input of mechanical energy ceased at a known time. It was seen that, as it propagated across the layer, the blast wave's amplitude persisted with little decay. This result extends similar findings, in previous experiments with 3D microparticle clouds, to the case of 2D clouds. In our cloud, out-of-plane displacements were observed, lending support to the possibility that an instability, driven by wakes in the ion flow, provides energy that sustains the blast wave's amplitude, despite the presence of gas damping.

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“…This nonequilibrium ion focus leads to the onset of the so-called "Schweigert" instability where growing horizontal oscillations of the dust particles around their equilibrium are observed. Since this instability works on particles trapped at different heights in the plasma sheath, a multilayer system with at least two layers is required to observe this instability [5,21,22,26].…”

Section: Introductionmentioning

confidence: 99%

Connecting the wakefield instabilities in dusty plasmas

Melzer

2014

Phys. Rev. E

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The wakefield, or ion focus, formed by ions streaming past dust particles trapped in the plasma sheath leads to two types of instabilities: the Schweigert instability in multilayer systems and the mode-coupling instability that already appears in single-layer dust systems. Here, a model is presented that treats both types of instability in a common description. The parameter space for the onset of the instabilities is determined. A new variant of the mode-coupling instability is found to arise from the interaction among the layers. For weak confinement, all instabilities continuously merge into each other. For stronger confinement of the dust mainly the Schweigert type of instability is observed.

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Melting of a dust crystal with defects

Cited by 10 publications

References 19 publications

Complex plasmas: a laboratory for strong correlations

Complex plasmas: a laboratory for strong correlations

Shocks propagate in a 2D dusty plasma with less attenuation than that due to gas friction alone

Connecting the wakefield instabilities in dusty plasmas

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