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arXiv 2003.14305cond-mat.str-elhep-lat
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非限定量子临界点的一致标度指数

Consistent scaling exponents at the deconfined quantum-critical point

Anders W. Sandvik, Bowen Zhao

摘要:

利用量子Monte Carlo方法研究了正方晶格$S=1/2$ $J$ - $Q$模型中反铁磁和价键固体基态之间的相变. $Q$项的临界关联函数给出对应于相关长度指数的值$ν= 0.455 \pm 0.002$的标度维数。该值与常规方法的先前(不太精确)结果一致,例如,近临界序参量的有限尺度标度。我们还研究了$L^2$格点的序参数的Binder累积量的$Q$ -导数,其$L$直到$448$ .斜率随$L^{1/ν}$增长,$ν$值与$Q$项的标度维数一致。没有迹象表明失控流到一级相变。$ν$的相互一致的估计提供了令人信服的支持,一个连续的deconfined量子临界点。

英文摘要:

We report a quantum Monte Carlo study of the phase transition between antiferromagnetic and valence-bond solid ground states in the square-lattice $S=1/2$ $J$-$Q$ model. The critical correlation function of the $Q$ terms gives a scaling dimension corresponding to the value $ν= 0.455 \pm 0.002$ of the correlation-length exponent. This value agrees with previous (less precise) results from conventional methods, e.g., finite-size scaling of the near-critical order parameters. We also study the $Q$-derivatives of the Binder cumulants of the order parameters for $L^2$ lattices with $L$ up to $448$. The slope grows as $L^{1/ν}$ with a value of $ν$ consistent with the scaling dimension of the $Q$ term. There are no indications of runaway flow to a first-order phase transition. The mutually consistent estimates of $ν$ provide compelling support for a continuous deconfined quantum-critical point.

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