二維微粒庫倫液體中集體激發微觀動力研究; Micro-dynamics of Cooperative Excitations in 2D Dust Coulomb Liquids

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题名:	二維微粒庫倫液體中集體激發微觀動力研究;Micro-dynamics of Cooperative Excitations in 2D Dust Coulomb Liquids
作者:	賴瀅如;Ying-Ju Lai
贡献者:	物理研究所
关键词:	微粒電漿;集體運動;micro-dynamics;Coulomb cluster;dusty plasmas;Non-Gaussian motions;cooperative fast particles
日期:	2002-06-19
上传时间:	2009-09-22 10:53:42 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	我們利用二維微粒電漿系統來研究二維庫倫液體中的集體激發微觀行為. 在微觀尺度下,液體展現異於巨觀中無序運動與結構. 微觀粒子在時間尺度小於熱平衡所需的時間時,展現了非高斯分布的位移分布. 其所對應的運動即是液體粒子開始要掙脫周圍粒子束傅, 而作出的de-caging運動. 我們針對此一運動來作其動力行為的研究, 尤其是它的尺度統計. 我們的研究顯示其尺度統計是符合一般非線性動力系統下常有的power law 關係. 此外,我們還探討邊界效應對二維庫倫團的運動的影響. Liquids, it is often thought that the strong stochastic thermal noise can excite random motion and lead to a disordered structure. Whether the micro-dynamics exhibits coherence in the time scale much shorter than the thermal relaxation time is an open question. From a more general view of modern nonlinear complex system, the liquid system can be treated as a strongly coupled sub-excitable system perturbed by noise. Note that noise not only has the disruptive effect, but also provides the constructive influence and induces the spatio-temporal coherence, especially enhanced under the spatial coupling. It is similar to the noise enhanced signal in the temporal system through stochastic resonance. In our glow discharge system, the suspended dust particles can be negatively charged by the highly mobile electrons and turn them into the Coulomb crystal or liquid state through their strong mutual Coulomb coupling. The proper spatial and temporal scales offer an opportunity to directly visualize the micro-structure and motions of this non-linear many-body system through video microscopy. In this work, we study the micro-dynamics of the dust Coulomb liquid system, which is less well explored due to its complicated disorder nature. Besides, the experimental and numerical studies on effects from geometry confinements are also discussed.
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