STUDY ON ONE-DIMENSIONAL CI PHASE TRANSITION WITH TRIPLE-WELL INTERACTIONS

• 作者: 许海波 许爱国 陈式刚
• 来源期刊: 中国物理(海外版)
• 年，卷（期）: 2000,（1）
• 页码范围: 42-48
• 页数: 7页
• 分类号: 6470R|6460|0570
• 语种: 英文

摘要

To study modulated structures and commensurate-incommensurate (CI) transitions, we generalize the FrenkelKontorova model to the Frenkel-Kontorova-Devonshire model where the interparticle interactions are the triple-well potential. By use of the so called effective potential method, numerical solutions of the eigenvalue problem are used to work out the exact phase diagrams of W, a triple-well potential. According to the winding number ω and the rotation number Ω, we analyze the periodicity of the phase diagram and find some complex but regular phase structures. These new structures result from the triple-well interatomic interactions. A series of new transition behaviors enrich the traditional understanding on the periodicity of CI transitions.