Phase transitions in normal mode spectra of two-dimensional clusters in an anisotropic power-law confining potential

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• 作者：Assia Bessaa ; ^{phys_maths1@yahoo.fr} ; Mourad Djebli ^{mdjebli@usthb.dz}
• 关键词：Mesoscopic 2D systems ; Phase transitions ; Clusters
• 刊名：Physica E: Low-dimensional Systems and Nanostructures
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：86
• 期：Complete
• 页码：117-123
• 全文大小：1465 K
• 卷排序：86

文摘

We present a numerical analysis of several phase transitions which take place in the eigenmode spectrum of a two-dimensional (2D) logarithmic cluster subjected to an anisotropic power law confinement. Varying the anisotropy in a non-parabolic soft confinement drives the system to undergo structural phase transitions of first order, while for a hard wall confinement this variation affects strongly the eigenmode spectrum and breaks the symmetry of the system due to the removal of degeneracy and the coupling between some normal modes.