Griffiths-McCoy singularities in the transverse field Ising model on the randomly diluted square lattice

被引：20

作者：

Ikegami, T ^{[1
]}

Miyashita, S

Rieger, H

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Osaka 5600043, Japan

[2] Forschungszentrum Julich, HLRZ, D-52425 Julich, Germany

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 08期

关键词：

QPT; Griffiths-McCoy singularities; multi-critical point; dynamical exponent;

D O I：

10.1143/JPSJ.67.2671

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The site-diluted transverse field Ising model in two dimensions is studied with Quantum-Monte-Carlo simulations. Its phase diagram is determined in the transverse field (Gamma) and temperature (T) plane for various (fixed) concentrations (p). The nature of the quantum Griffiths phase at zero temperature is investigated by calculating the distribution of the local zero-frequency susceptibility. It is pointed out that the nature of the Griffiths phase is different for small and large Gamma.

引用

页码：2671 / 2677

页数：7

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