计算物理 ›› 2000, Vol. 17 ›› Issue (S1): 27-32.DOI: 10.3969/j.issn.1001-246X.2000.01.006

• 论文 • 上一篇    下一篇

一个FKD模型的基态与相图

许海波1,2, 王光瑞2, 陈式刚2   

  1. 1. 中国工程物理研究院研究生部, 北京 100088;
    2. 北京应用物理与计算数学研究所, 北京 100088
  • 收稿日期:1999-07-07 修回日期:1999-09-15 出版日期:2000-12-25 发布日期:2000-12-25
  • 作者简介:许海渡(1966~),男,河南灵宝,副教授,博士生。从事非平衡统计物理的研究,北京2101信箱,100088
  • 基金资助:
    国家自然科学基金(19774049);中国工程物理研究院基金(970116;980112)

THE GROUND STATES AND PHASE DIAGRAMS OF ONE FKD MODEL

XU Hai-bo1,2, WANG Guang-rui2, CHEN Shi-gang2   

  1. 1. Graduate School, China Academy of Engineering Physics, Beijing, 100088, P R China;
    2. Institute of Applied Physics and Computational mathematics, Beijing, 100088, P R China
  • Received:1999-07-07 Revised:1999-09-15 Online:2000-12-25 Published:2000-12-25

摘要: 将FK模型推广到粒子间相互作用为三阱势的FKD模型。利用有效势方法,确定了原子的基态和相图,并利用转数与绕数的定义,分析了相图的周期性。

关键词: CI相变, 有效势, 转数, 绕数, Farey树

Abstract: It generalizes the Frenkel-Kontorova model to the Frenkel-Kontorova-Devonshire model where the interactions are the triple-well potential. By use of the effective potential method, numerical solutions of eigenvalue problem are used to work out the exact phase diagrams of W a triple-well potential and V a piecewise parabolic potential. According to the winding number ω and the rotation number Ω, the periodicity of the phase diagram is analyzed and some complex but regular phase structures are found.

Key words: CI transitions, effective potential, rotation number, winding number, Farey tree

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