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arXiv 2005.00474cond-mat.stat-mech
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q态Potts和Clock模型的全密度计算:对称性破缺下界面密度的重入

Complete Density Calculations of q-State Potts and Clock Models: Reentrance of Interface Densities under Symmetry Breaking

E. Can Artun, A. Nihat Berker

摘要:

所有的本地键态密度计算的q-状态波茨和时钟模型在三个空间维度,d=3。计算是在等级格点上用精确的重整化群完成的,包括密度递推关系,同时也是立方格点的Migdal-Kadanoff近似。重入行为被发现在对称性破缺下的界面密度,在这个意义上,在降低温度的密度值首先增加,然后降低到零温度时的零值。对于这种行为,提出了一种物理机制。发现两种模型的相变之间的对比,并解释对齐和熵,状态的数量q趋于无穷大。对于时钟模型,重整化群流多达20个能量被使用。

英文摘要:

All local bond-state densities are calculated for q-state Potts and clock models in three spatial dimensions, d=3. The calculations are done by an exact renormalization group on a hierarchical lattice, including the density recursion relations, and simultaneously are the Migdal-Kadanoff approximation for the cubic lattice. Reentrant behavior is found in the interface densities under symmetry breaking, in the sense that upon lowering temperature the value of the density first increases, then decreases to its zero value at zero temperature. For this behavior, a physical mechanism is proposed. A contrast between the phase transition of the two models is found, and explained by alignment and entropy, as the number of states q goes to infinity. For the clock models, the renormalization-group flows of up to twenty energies are used.

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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