通过量子几何学在迪拉克半金属中的电场调节THz发射
Ziqi Li1, Dongsheng Yang2,3, Fei Wang2,4
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
Nano letters
|April 30, 2025
概括
研究人员使用PtTe2.2的量子几何学实现了太赫兹旋转发射的电气控制. 这种方法为未来的spintronic设备提供了自旋霍尔导电性的非挥发性调整.
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
- 这就是Spintronics.
背景情况:
- 在太赫兹 (THz) 频率上实现自旋自由度的非挥发性控制对于先进的自旋电子学至关重要.
- 目前的方法通常需要场循环或残余磁化,限制了实际应用.
研究的目的:
- 用迪拉克半金属的量子几何学来证明THz自旋电子辐射的纯电可调性.
- 探索在THz频率上对自旋霍尔导电性的非挥发性控制.
主要方法:
- 使用了 heterobilayer 结构,将铁电基板与 PtTe2 和铁磁材料相结合.
- 电调节了PtTe2的费米水平和贝里曲率,以控制其自旋霍尔导电性.
- 运用密度函数理论 (DFT) 来证实实验发现.
主要成果:
- 通过电气控制PtTe2的自旋霍尔导电性,实现了THz发射幅度的21%调制.
- 在恒定磁场下,证明了THz自旋电子辐射的非挥发性调整.
- DFT的计算证实了注诱导的贝里曲率变化改变了旋转的霍尔导电性.
结论:
- 利用量子几何学,特别是贝里曲率,可以实现高效的超快速自旋电荷转换.
- 开发的方法为可调节的旋转Hall THz设备提供了一种复杂性低,能效和非挥发性路径.
- 这些发现为量子几何学在基于旋转的逻辑和超快电子学中的新应用铺平了道路.
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