在随机正规图上对安德森模型进行重新规范化组分析
Carlo Vanoni1,2, Boris L Altshuler3, Vladimir E Kravtsov4
1International School for Advanced Studies, Trieste 34136, Italy.
概括
我们使用重新规范化组方法在随机正则图上分析了安德森定位. 我们的研究结果解释了混乱系统中不寻常的缩放行为,并支持大型系统大小的单参数缩放假设.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 统计力学 统计力学
- 无序的系统是无序的系统.
背景情况:
- 安德森局部化描述了在无序系统中抑制波函数传播的情况.
- 随机正规图 (RRG) 提供了一个简化的模型来研究高维的本地化.
- 之前的重规范化组 (RG) 研究在捕捉复杂的缩放行为方面存在局限性.
研究的目的:
- 将重新规范化组 (RG) 分析扩展到随机正规图 (RRG) 上的安德森定位.
- 在这种情况下,研究一个参数缩放假设的有效性.
- 解释物理量在局部化过渡附近的非单调行为.
主要方法:
- 在RRGs上的安德森模型上,应用了通用的重规范化组 (RG) 分析.
- 分析了RG方程,以了解变化连接的参数流.
- 运行分数维的β函数被导出并分析.
主要成果:
- 对于自身状态和光谱可观测的大型系统大小,一参数缩放假设得到恢复.
- 在β函数中具有不同标志和依赖性的两个术语解释了非单调的行为.
- RG分析为RRG上的安德森定位中观察到的数值数据提供了连贯的解释.
结论:
- 开发的RG理论成功地解释了在RRG上的安德森定位中观察到的复杂缩放.
- 该研究将理论预测与对无序系统的数值发现相协调.
- 这个框架提供了对多体局部化现象的见解.
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