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arXiv 0707.0509cond-mat.stat-mechcond-mat.str-el
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量子临界现象中的序参量关联函数

Order-Parameter Correlation Functions in Quantum Critical Phenomena

Min-Chul Cha, Gerardo Ortiz

摘要:

研究了量子临界现象中序参量(两点)关联函数的函数形式。与通常的知识相反,当不存在粒子-空穴对称性时,我们发现临界态的等时关联函数不显示发散的关联长度。通过对$d=2$空间中量子转子模型的Monte Carlo计算,说明了我们的结论

英文摘要:

We investigate the functional form of the order-parameter (two-point) correlation function in quantum critical phenomena. Contrary to the common lore, when there is no particle-hole symmetry we find that the equal-time correlation function at criticality does not display a diverging correlation length. We illustrate our conclusions by Monte Carlo calculations of the quantum rotor model in $d=2$ space dimensions

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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