Melting of Coulomb-interacting classical particles in 2D irregular traps

Melting of Coulomb-interacting classical particles in 2D irregular traps
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二维不规则陷阱中库仑相互作用经典粒子的熔化

DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Ghosal
A. Ghosal
中科院分区：
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文献类型：
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作者：
Dyuti Bhattacharya;A. Ghosal

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摘要 由少量相互作用组成的自形成刚性结构的“熔化” 使用以下方法研究限制在不规则二维空间中的经典粒子 蒙特卡洛模拟。结果表明，长程库仑斥力的相互作用 这些颗粒和不规则限制之间在低温下产生类固相 具有键取向顺序的温度，然而，位置顺序是 即使在最低温度下也会耗尽。考虑到热波动，这 通过破坏类固相顺利地过渡到类液相 键向顺序。坚固性的崩溃被证明是由缺陷介导的，并且 得益于自由向错的扩散。不同体质的行为 研究了交叉区域的可观测值。这些结果将帮助我们量化 在具有受限几何形状的系统的实验中发现的熔化。
Abstract The “melting” of self-formed rigid structures made of a small number of interacting classical particles confined in an irregular two-dimensional space is investigated using Monte Carlo simulations. It is shown that the interplay of long-range Coulomb repulsions between these particles and the irregular confinement yields a solid-like phase at low temperatures that possesses a bond-orientational order, however, the positional order is depleted even at the lowest temperatures. Upon including thermal fluctuations, this solid-like phase smoothly crosses over to a liquid-like phase by destroying the bond-orientational order. The collapse of solidity is shown to be defect mediated, and aided by the proliferation of free disclinations. The behaviour of different physical observables across the crossover region is studied. These results will help us quantifying the melting found in experiments on systems with confined geometries.