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物理学报. 2008, 57(9): 5944-5950.
doi: 10.7498/aps.57.5944.
具有长程相互作用S-1/2 XY链的研究
- 收稿日期: 2008-01-06
- 修回日期: 2008-02-22
- 刊出日期: 2008-09-20
摘要: 采用平均场Jordan - Wigner 变换分析方法,研究了外场中且具有Z方向均匀长程相互作用自旋－1/2 XY链的热力学性质，得到了系统格点的亥姆赫兹自由能、内能、比热、磁化强度、磁化率等热力学量的解析表达式及其数值解,讨论了系统的一级和两级相变，数值结果在退化条件下与其他文献的结果符合很好.
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关键词:
- XY链 /
- 平均场Jordan-Wigner变换 /
- 长程相互作用
English Abstract
Study of the XY chain with long-range interactions
- Received Date:
06 January 2008
- Accepted Date:
22 February 2008
- Published Online:
20 September 2008
Abstract: Using the mean-field Jordan-Wigner transformation analysis, we have studied the one-dimensional spin-1/2 XY chain with Z-directional uniform long-range interactions in the external magnetic field. We have obtained such results as the Helmholtz free energy, internal energy, specific heat, magnetization and isothermal susceptibility. We also discuss the first and second-order phase transitions of the system at a finite temperature. Our results agree with results published in literature.
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