在h-BN/石墨烯/h-BN范德瓦尔斯垂直异构结构中具有光效应的纯自旋电流生成
Xixi Tao1, Peng Jiang2, Yaojun Dong1
1School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, China.
Physical chemistry chemical physics : PCCP
|November 28, 2024
概括
研究人员开发了一种新方法,利用范德瓦尔斯异构结构中的光效应 (PGE) 产生纯自旋电流. 这种方法提供了一种强大的方法,可以为自旋电子设备创建自旋电流.
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
- 纳米技术纳米技术
背景情况:
- 斯宾特罗尼克斯的目标是利用电子自旋进行信息处理.
- 高效地产生纯自旋电流对于自旋电子设备的开发至关重要.
- 光效应 (PGE) 提供了一种产生自旋电流的途径,但控制和效率仍然是挑战.
研究的目的:
- 用光效应 (PGE) 来计算演示一种用于产生纯自旋电流的新方法.
- 调查范德瓦尔斯 (vdW) 异构结构,特别是h-BN/石墨烯/h-BN在促进纯自旋电流生成中的作用.
- 探索应变和结构修改对纯自旋电流产生的影响.
主要方法:
- 使用h-BN/石墨烯/h-BN vdW异构结构进行运输交叉点的计算建模.
- 在不同光子能量和极化状态下 (线性,圆形,圆) 分析旋转电流的产生.
- 研究压力和拉力应变对层间距离和旋转电流输出的影响.
- 检查旋转分裂和纯旋转电流的产生与增加的h-BN层.
主要成果:
- 在设计的异构结构中,通过PGE连续生成纯自旋电流,无电荷电流.
- 纯自旋电流的产生独立于光子能量,偏振角度和偏振类型.
- vdW异构的应变工程 (压缩/拉伸) 允许纯自旋电流的产生.
- 增加的h-BN层导致显著的旋转分裂和增强的纯旋转电流.
结论:
- 通过计算证明了一种新的,强大的方法,用于在h-BN/石墨烯/h-BN vdW异构中使用PGE产生纯自旋电流.
- 该机制依赖于结构逆向对称和实时空间旋转极化反对称的相互作用.
- 这项工作突出了VDW异构在设计高效的自旋电子设备中的潜力,并为石墨烯纳米带中纯自旋电流生成提供了途径.
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