arXivDaily arXiv每日学术速递 周一至周五更新
看起来今天可以划水了
arXiv 1102.2607cond-mat.stat-mech
收藏

3 He在具有二、三格点交换作用的Husimi格点上的Kagome近似

Kagome Approximation for 3He on Husimi Lattice with Two- and Three-Site Exchange Interactions

N. Ananikian, V. Hovhannisyan, H. Lazaryan

摘要:

在Husimi格点上研究了强磁场中具有两自旋和三自旋交换作用的海森堡模型的伊辛近似。该模型可以看作是3 He吸附在石墨表面第三层(戈薇晶格)的近似。利用动态方法,我们找到了配分函数的精确递归关系。对于不同的交换参数和温度值的磁化强度图绘制,并表明,磁化强度的模型从铁磁到反铁磁依赖于模型参数的值。对于反铁磁情况,在1/3饱和磁场处得到磁化平台。讨论了递推关系的李雅普诺夫指数,发现在热力学极限下不存在分歧点。利用中立不动点分析了该模型的Yang-Lee零点,证明了该模型的Yang-Lee零点位于半径为R=1的圆弧上。

英文摘要:

The Ising approximation of the Heisenberg model in a strong magnetic field, with two-, and three-spin exchange interactions are studied on a Husimi lattice. This model can be considered as an approximation of the third layer of 3He absorbed on the surface of graphite (kagome lattice). Using dynamic approach we have found exact recursion relation for the partition function. For different values of exchange parameters and temperature the diagrams of magnetization are plotted and showed that magnetization properties of the model vary from ferromagnetic to antiferromagnetic depending from the value of model parameters. For antiferromagnetic case magnetization plateau at 1/3 of saturation field is obtained. Lyapunov exponent for recursion relation are considered and showed absents of bifurcation points in thermodynamic limit. The Yang-Lee zeros are analyzed in terms of neutral fixed points and showed that Yang-Lee zeros of the model are located on the arcs of the circle with the radius R=1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑