静态和动态的弗里德尔振荡在一个电子气体与分数分散的分数分散
V A Stephanovich1, E V Kirichenko1, K Książek1
1University of Opole, Institute of Physics, Oleska 48, 45-052 Opole, Poland.
Physical review. E
|October 21, 2025
概括
使用分数拉普拉西亚模拟的材料中的障碍,抑制和局部化磁相互作用,如鲁德曼-基特尔-卡苏亚-约西达 (RKKY) 相互作用,影响旋转器件.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子力学就是量子力学.
背景情况:
- 鲁德曼-基特尔-卡苏亚-约西达 (RKKY) 相互作用介导金属中局部时刻之间的间接磁交换.
- 了解无序系统中的RKKY相互作用对于开发自旋电子和量子设备至关重要.
- 对RKKY相互作用,特别是弗里德尔振荡的障碍影响在不同维度中尚未完全理解.
研究的目的:
- 研究1D,2D和3D几何体内的无序系统中RKKY相互作用的静态和动态行为.
- 模拟使用分数拉普拉西安的乱,具有莱维指数α<2.2.
- 分析失调强度如何影响弗里德尔振荡和旋转密度激发的局部化和减.
主要方法:
- 将分数拉普拉斯运算符 (莱维指数α<2) 引入哈密尔顿式来模型的乱.
- 对RKKY相互作用的静态特性进行分析,重点关注弗里德尔振荡.
- 检查时间域中自旋密度激发的动态行为.
主要成果:
- 障碍显著抑制和定位RKKY相互作用中的弗里德尔振荡,无论是静态还是动态.
- 越来越多的障碍 (α下降) 会导致更局部的,扭曲的和快速减弱的振荡.
- 动态旋转密度激发在2D中显示出延迟和受限的传播,并显著减弱.
结论:
- 分数拉普拉斯式为研究无序和低维系统中的RKKY相互作用提供了一个统一的框架.
- 这些发现对理解和设计用于自旋电子的材料,例如稀释磁性半导体 (例如GaMnAs,InMnAs) 有重大意义.
- 这项研究促进了对磁量子设备及其潜在应用的理解.
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