| 用3-态Potts模型研究液晶薄膜相变 |
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| 引用本文： | 仁毅志,刘景泉,区镜添.用3-态Potts模型研究液晶薄膜相变[J].南开大学学报,2002,35(3):123-125. |
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| 作者姓名： | 仁毅志 刘景泉 区镜添 |
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| 作者单位： | 南开大学物理科学学院，南开大学物理科学学院，南开大学物理科学学院 天津，300071，天津，300071，天津，300071 |
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| 摘 要： | 用3态Potts模型研究液晶薄相变，对给定的L层薄膜，每层的相变温度都由自由能最小决定，自由能采用变分累积展开方法计算，在此基础上进一步计算了热容，计算结果与实验（样品为54COOBC液晶薄膜）基本符合。
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| 关 键 词： | 3－态Potts模型 液晶薄膜 变分累积展开方法 相变 哈密顿量 热容 自由能 |
| 文章编号： | 0465-7942(2002)03-0123-03 |
THE STUDY ON THE PHASE TRANSITION OF ULTRATHIN LIQUID CRYSTAL FILMS BY THE THREE-LEVEL POTTS MODEL |
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| REN Yizhi,LIU Jingquan,OU Jingtian.THE STUDY ON THE PHASE TRANSITION OF ULTRATHIN LIQUID CRYSTAL FILMS BY THE THREE-LEVEL POTTS MODEL[J].Acta Scientiarum Naturalium University Nankaiensis,2002,35(3):123-125. |
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| Authors: | REN Yizhi LIU Jingquan OU Jingtian |
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| Abstract: | With the aid of the three-level Potts model, the phase transition in free-standing liquid crystal film are described. In a film of L molecular layers, the transition temperature for individual layers is determined separatelyby the bifurcation point of the free energy, and free energy are calculated with the variational cumulant expansion (VCE), from which the specific heat is also calculated. The calculated heat capacity qualitatively reproduces the observed anomaly around transition temperatures in experiments on free-standing 54COOBC films of two are more molecular layes.$$$$ |
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| Keywords: | Liquid crystals variational-cumulant expansion phase transition |
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