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arXiv 0704.1194cond-mat.dis-nncond-mat.stat-mech
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随机横场Ising链中伪临界点分布的有限尺寸标度

Finite-size scaling of pseudo-critical point distributions in the random transverse-field Ising chain

Ferenc Iglói, Yu-Cheng Lin, Heiko Rieger, Cécile Monthus

摘要:

研究了具有无限随机不动点描述的量子相变的一维随机量子磁体中有限尺寸伪临界点的分布。伪临界点的定义有三种不同的方式:平均纠缠熵的最大值的位置,表面磁化的标度行为,和软模的能量。所有这三个导致的伪临界横向场的对数正态分布,其中的宽度尺度为$L^{-1/ν}$与$ν=2$和移动的平均值尺度为$L^{-1/ν_{typ}}$与$ν_{typ}=1$,我们涉及到在临界区域的平均和典型量的标度。

英文摘要:

We study the distribution of finite size pseudo-critical points in a one-dimensional random quantum magnet with a quantum phase transition described by an infinite randomness fixed point. Pseudo-critical points are defined in three different ways: the position of the maximum of the average entanglement entropy, the scaling behavior of the surface magnetization, and the energy of a soft mode. All three lead to a log-normal distribution of the pseudo-critical transverse fields, where the width scales as $L^{-1/ν}$ with $ν=2$ and the shift of the average value scales as $L^{-1/ν_{typ}}$ with $ν_{typ}=1$, which we related to the scaling of average and typical quantities in the critical region.

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