Packing and melting of mesoscopically confined two-dimensional Coulomb crystals in straight narrow channels

NCU Institutional Repository > 理學院 > 物理學系 > 期刊論文 > Item 987654321/52804

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/52804

题名:	Packing and melting of mesoscopically confined two-dimensional Coulomb crystals in straight narrow channels
作者:	Liu,KA;Lin,I
贡献者:	物理學系
关键词:	QUASI-2D DUSTY PLASMAS;COMPLEX PLASMAS;CRYSTALLIZATION;TRANSITION;DYNAMICS
日期:	2010
上传时间:	2012-06-11 10:44:58 (UTC+8)
出版者:	國立中央大學
摘要:	The microstructure and melting dynamics of the two-dimensional mesoscopic Coulomb crystal with 1/r-type mutual interaction force and parabolic transverse confining potential, under different degrees of incommensurability, are investigated through molecular-dynamics simulation. To tune the degree of incommensurability, N(a) extra particles are added into the commensurate uniform triangular lattice which has seven-layer structure and 40 particles in each layer with the periodic longitudinal boundary condition, until the system reaches another commensurate packing with eight-layer structure at N(a)=40. It is found that the increasing incommensurability with the increasing Na or N(a) or 40-N(a) gradually deteriorates the structural order with the presence of intrinsic defects and the anisotropic bond-length distribution, except for the defect-free configurations at a few magic N(a)'s. The system prefers the seven-and the eight-layer single structures through the entire crystal for the low-and the high-N(a) regimes, respectively, and the configurations with seven-and eight-layer domain mixtures for 18 <= Na <= 24. The increasing strain or the worse local particle interlocking around the intrinsic defects with the increasing incommensurability also causes the easier structural rearrangement associated with the easier particle hopping and the earlier onset of melting transition. The transverse confinement suppresses the transverse motion, induces nonuniform melting, and sustains the layered structure after melting.
關聯:	PHYSICAL REVIEW E
显示于类别:	[物理學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	303	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....