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Tuning correlations in multi-component plasmas

Patrick Ludwig, Hauke Thomsen, Karsten Balzer, Alexei Filinov, Michael Bonitz2010年Plasma Physics and Controlled FusionIF 2.2出版社

Spontaneous, correlation-driven structure formation is one of the most fundamental collective processes in nature. In particular, particle ensembles in externally controlled confinement geometries allow for a systematic investigation of strong correlation and quantum effects over broad ranges of the relevant trap and plasma parameters. An exceptional feature inherent to finite systems is the governing role of symmetry and surface effects leading to similar collective behaviour in physical systems on vastly different length and energy scales. Considering (i) confined complex (dusty) plasmas and (ii) charge asymmetric bilayers, the effective range of the pair interaction emerges as a key quantity taking effect on the self-organized structure formation. Additional interest arises from the possible mass asymmetry of the plasma constituents in bilayers. Translating the results from (unconfined) 3D plasmas to bilayer systems, it is shown that the critical mass ratio required for crystallization of the heavy plasma component can be drastically reduced such that this effect becomes experimentally accessible.

日本語訳

自発的構造形成は、自然界における最も基本的な集団過程の一つである。特に、外部制御された閉じ込め幾何学における粒子集団は、関連するトラップおよびプラズマパラメータの広い範囲にわたって、強い相関と量子効果の系統的な研究を可能にする。有限系に固有の特異な特徴は、対称性と表面効果が支配的な役割を果たし、それが桁違いに異なる長さおよびエネルギースケールを持つ物理系において類似した集団挙動をもたらすことである。(i)閉じ込められた複合(ダスト)プラズマおよび(ii)電荷非対称二層系を考慮すると、ペア相互作用の有効範囲が、自己組織化構造形成に影響を与える主要な量として浮かび上がる。さらに、二層系におけるプラズマ構成粒子の質量非対称性からも追加の効果が生じる可能性がある。(非閉じ込め)3次元プラズマから二層系への結果の適用を通じて、重いプラズマ成分の結晶化に必要な臨界質量比が大幅に低減され得ることが示され、これによりこの効果は実験的にアクセス可能となる。

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