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arXiv cond-mat/0010397cond-mat.dis-nn
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稀释海森堡反铁磁体非普适量子相变的经典关联长度指数

Classical Correlation-Length Exponent in Non-Universal Quantum Phase Transition of Diluted Heisenberg Antiferromagnet

C. Yasuda, S. Todo, K. Harada, N. Kawashima, S. Miyashita, H. Takayama

摘要:

利用量子蒙特卡罗模拟和连续虚时间环算法研究了正方晶格上格位稀释海森堡反铁磁体的量子相变的临界行为.尽管交错自旋关联函数以幂律衰减,其中指数明确地取决于自旋大小$S$,但是相关长度指数是经典的,即,$ν=4/3$。这意味着表征非普适量子相变的长度尺度只不过是连接的自旋团簇的平均尺寸。

英文摘要:

Critical behavior of the quantum phase transition of a site-diluted Heisenberg antiferromagnet on a square lattice is investigated by means of the quantum Monte Carlo simulation with the continuous-imaginary-time loop algorithm. Although the staggered spin correlation function decays in a power law with the exponent definitely depending on the spin size $S$, the correlation-length exponent is classical, i.e., $ν=4/3$. This implies that the length scale characterizing the non-universal quantum phase transition is nothing but the mean size of connected spin clusters.

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