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arXiv 1010.4273cond-mat.str-el
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自旋2链拓扑量子相变的临界理论

Critical theory of the topological quantum phase transition in a spin-2 chain

Hong-Chen Jiang, Stephan Rachel, Zheng-Yu Weng, Shou-Cheng Zhang, Zhenghan Wang

摘要:

利用密度矩阵重整化群和精确对角化方法,系统地研究了S=2自旋链的相图,证实了AKLT-SZH模型中存在二聚体相.我们发现,二聚体和SZH相之间的整个相边界,包括多临界点,是一个具有相同的中心荷$c=5/2$的临界线。最后,我们提出并证实了这条线可以用$\rm SO(5)_1$ Wess-Zumino-Witten(WZW)共形场论来描述。

英文摘要:

We systematically study the phase diagram of S=2 spin chain, by means of density-matrix renormalization group and exact diagonalization methods and confirm the presence of a dimer phase in the AKLT--SZH model. We find that the whole phase boundary between the dimer and SZH phases, including the multicritical point, is a critical line with the same central charge $c=5/2$. Finally, we propose and confirm that this line can be described by the $\rm SO(5)_1$ Wess-Zumino-Witten (WZW) conformal field theory.

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