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arXiv 1509.05596cond-mat.stat-mech
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分形格点上伊辛模型的相变

Phase Transition of the Ising Model on Fractal Lattice

Jozef Genzor, Andrej Gendiar, Tomotoshi Nishino

摘要:

在具有分形结构的平面晶格上研究了伊辛模型的相变。在晶格上,当区域的线性尺寸扩展四倍时,穿过有限区域边界的键的数量加倍。利用高阶张量重整化群方法计算了系统的自由能和自发磁化强度。该系统表现出有序-无序相变,其临界指数与正方格子伊辛模型的临界指数不同.即使在临界点处,在密度矩阵谱中也观察到指数衰减。这是可能的解释,因为分形几何的系统是少纠缠。

英文摘要:

Phase transition of the Ising model is investigated on a planar lattice that has a fractal structure. On the lattice, the number of bonds that cross the border of a finite area is doubled when the linear size of the area is extended by a factor of four. The free energy and the spontaneous magnetization of the system are obtained by means of the higher-order tensor renormalization group method. The system exhibits the order-disorder phase transition, where the critical indices are different from that of the square-lattice Ising model. An exponential decay is observed in the density matrix spectrum even at the critical point. It is possible to interpret that the system is less entangled because of the fractal geometry.

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。

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