强耦合库仑团簇热力学和自组织的实验研究
Thermodynamics and Self-organization of Strongly Coupled Coulomb Clusters: An Experimental Study
摘要：
在本实验中，我们研究了经典二维库仑团簇的热力学和自组织随团簇尺寸的变化。在DPEx装置中，对不同粒子数的团簇在直流辉光放电氩等离子体中进行了实验研究。使用局部取向序参量（$|{ψ_6}|$）的所有配置的每个单独的粒子周围的Hedronal对称性进行量化。筛选库仑耦合参数，这起着关键作用，在确定的库仑簇的热力学性质，估计使用朗之万动力学，并发现是敏感的簇中存在的粒子数。此外，通过动态熵的估计，研究了团簇从亚稳态到基态的自组织过程和单个粒子的动力学行为。我们的研究结果表明，一个强耦合的库仑簇系统的构型排序和热力学之间的密切联系-一种见解，可能是在分析和控制更广泛的一类有限系统的微观动力学的实用价值。
英文摘要：
In this experimental work, the thermodynamics and self-organization of classical two-dimensional Coulomb clusters are studied as a function of the cluster size. The experiments are carried out in a DC glow discharge Argon plasma in the Dusty Plasma Experimental (DPEx) device for clusters with different number of particles. Hexagonal symmetry around each individual particle is quantified using the local orientational order parameter ($|{ψ_6}|$) for all the configurations. The screened Coulomb coupling parameter, which plays a key role in determining the thermodynamic nature of a Coulomb cluster, is estimated using Langevin dynamics and found to be sensitive to the number of particles present in the cluster. In addition, the process of self-organization and the dynamics of individual particles of the cluster as it changes from a metastable state to the ground state are examined through the estimation of dynamic entropy. Our findings suggest an intimate link between the configurational ordering and the thermodynamics of a strongly coupled Coulomb cluster system - an insight that might be of practical value in analysing and controlling the micro dynamics of a wider class of finite systems.
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