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arXiv 1509.02804cond-mat.stat-mechmath-phmath.MP
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三角格点的Q着色:精确指数和共形场论

Q-colourings of the triangular lattice: Exact exponents and conformal field theory

Eric Vernier, Jesper Lykke Jacobsen, Jesús Salas

摘要:

我们重新审视的问题,Q-着色的三角晶格使用映射到一个可积的自旋一模型,这可以完全解决使用Bethe Answer技术。特别地,我们关注本征能级g_2以上的低能激发,Baxter表明,在Q_0 <= Q <= 4的Fortuin-Kasteleyn(色多项式)表示中,这支配着传递矩阵谱,其中Q_0 = 3.819671.我们认为,g_2和它的标度水平定义了一个共形不变的理论,所谓的制度IV,它提供了实际的描述(解析继续)着色问题在一个更广泛的范围内,即2 < Q <= 4。确定了相应的共形场论,并导出了精确的临界指数。我们讨论了它们对非零温度下反铁磁三角晶格Potts模型相图的影响。最后,我们将我们的研究结果与最近在自旋为1的任意子链领域的观察。

英文摘要:

We revisit the problem of Q-colourings of the triangular lattice using a mapping onto an integrable spin-one model, which can be solved exactly using Bethe Ansatz techniques. In particular we focus on the low-energy excitations above the eigenlevel g_2, which was shown by Baxter to dominate the transfer matrix spectrum in the Fortuin-Kasteleyn (chromatic polynomial) representation for Q_0 <= Q <= 4, where Q_0 = 3.819671... We argue that g_2 and its scaling levels define a conformally invariant theory, the so-called regime IV, which provides the actual description of the (analytically continued) colouring problem within a much wider range, namely 2 < Q <= 4. The corresponding conformal field theory is identified and the exact critical exponents are derived. We discuss their implications for the phase diagram of the antiferromagnetic triangular-lattice Potts model at non-zero temperature. Finally, we relate our results to recent observations in the field of spin-one anyonic chains.

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