对二维和三维随机量子钟和波茨模型的普遍关键行为的数值证据
Valentin Anfray1, Christophe Chatelain2
1Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France.
Physical review. E
|August 16, 2023
概括
这项研究研究了量子钟和波茨模型中的格里菲斯相. 证据表明,这些阶段存在,特别是在随机波茨模型中,临界行为由强度障碍的无限障碍固定点控制.
科学领域:
- 统计力学 统计力学
- 凝聚物质物理学 凝聚物质物理学
- 量子多体系统是一个量子多体系统.
背景情况:
- 对无序量子模型的研究对于理解复杂材料至关重要.
- 格里菲斯相,由于罕见的大波动而改变热力学行为的区域,是无序系统中的一个关键现象.
研究的目的:
- 调查格里菲斯相在二维和三维随机量子q状态时钟和波茨模型中的存在和特征.
- 分析这些模型的关键行为,特别是在强烈的障碍条件下.
主要方法:
- 蒙特卡洛模拟被用于对同等经典模型的局部易感度的综合概率分布进行抽样.
- 强度障碍重规范化组 (SDRG) 方法被用来研究随机量子时钟模型的临界点.
主要成果:
- 数字证据支持在二维随机波茨模型中存在格里菲斯相,并分析了有限大小的效应.
- 随机量子时钟模型也显示了格里菲斯阶段的迹象,尽管具有更显著的有限大小效应.
- 在强度失序时,随机量子时钟模型的关键行为与波茨模型的所有q状态的无限失序固定点保持一致.
结论:
- 这项研究为混乱量子模型中的格里菲斯相提供了数值证据.
- 随机量子时钟模型在强度乱时的临界行为受到波茨模型相同的固定点的控制.
- 由于SDRG方法在弱失序的局限性,因此无法在该制度中得出最终结论.
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