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arXiv 1606.07449cond-mat.stat-mechhep-th
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三维以下耦合序参量的普适性态

Universal behavior of coupled order parameters below three dimensions

Julia Borchardt, Astrid Eichhorn

摘要:

我们探讨了具有两个竞争序参量的模型中的普遍临界行为,以及尺寸为$d \leq 3$的O(N)+O(M)对称性。在d=3中,总是恰好有一个稳定的重整化群不动点,对应于双临界或四临界行为。采用新颖的伪谱技术求解二维场空间中的泛函重整化群方程,我们揭示了d<3中更复杂的不动点结构,其中两个额外的双临界不动点起作用。当d=2时,我们发现N=M的范围有几个同时稳定的不动点,表明几个普适类共存。

英文摘要:

We explore universal critical behavior in models with two competing order parameters, and an O(N)+O(M) symmetry for dimensions $d \leq 3$. In d=3, there is always exactly one stable Renormalization Group fixed point, corresponding to bicritical or tetracritical behavior. Employing novel, pseudo-spectral techniques to solve functional Renormalization Group equations in a two-dimensional field space, we uncover a more intricate structure of fixed points in d<3, where two additional bicritical fixed points play a role. Towards d=2, we discover ranges of N=M with several simultaneously stable fixed points, indicating the coexistence of several universality classes.

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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