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arXiv 0705.4462cond-mat.stat-mechhep-th
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连续相变附近关联函数的双参数标度

Two-parameter scaling of correlation functions near continuous phase transitions

Nils Hasselmann, Andreas Sinner, Peter Kopietz

摘要:

本文利用两参数标度形式G(k)= k_c^{-2} g(k ≠,k/k_c)讨论了连续相变附近的序参量关联函数,其中k是波矢,k是关联长度,依赖于相互作用的非普适动量标度k_c在临界不动点处保持有限.关联函数描述了整个临界状态,并捕获了经典到临界的交叉。单参数缩放仅在极限k/k_c->0中恢复。利用泛函重整化群给出了Ising普适类g(x,y)的近似计算.

英文摘要:

We discuss the order parameter correlation function in the vicinity of continuous phase transitions using a two-parameter scaling form G(k) = k_c^{-2} g(kξ,k/k_c), where k is the wave-vector, ξis the correlation length, and the interaction-dependent non-universal momentum scale k_c remains finite at the critical fixed point. The correlation function describes the entire critical regime and captures the classical to critical crossover. One-parameter scaling is recovered only in the limit k/k_c->0. We present an approximate calculation of g(x,y) for the Ising universality class using the functional renormalization group.

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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