在迪拉克半金属CD_{3}As_{2}中异常的霍尔效应被平面内磁场探测到
Shinichi Nishihaya1, Hiroaki Ishizuka1, Yuki Deguchi1
1Institute of Science Tokyo, Department of Physics, Tokyo 152-8551, Japan.
Physical review letters
|September 22, 2025
概括
研究人员在非磁性迪拉克半金属Cd_{3}As_{2}膜中量化探测了场诱导的异常霍尔效应 (AHE). 一个三重对称的AHE组件与平面内磁场旋转一起出现,为轨道磁化提供了新的见解.
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
- 量子运输现象 量子运输现象
背景情况:
- 异常霍尔效应 (AHE) 是一种与布洛赫波函数几何相关的运输现象,可在磁性和非磁性系统中观察到.
- 在非磁性材料中检测磁场诱导的AHE是具有挑战性的,因为与洛伦兹力相比,Zeeman和自旋轨道合的小频段调制具有挑战性.
- 对于非磁性系统中的AHE来说,需要通过外部场来破坏时间逆向对称.
研究的目的:
- 在非磁性迪拉克半金属Cd_{3}As_{2}膜中量化探测场诱导的AHE.
- 为了调查AHE与平面内磁场旋转的出现.
- 探索电子密度在调节AHE中的作用.
主要方法:
- 使用迪拉克半金属CD_{3}作为_{2}薄膜.
- 在霍尔偏移平面内应用和旋转磁场.
- 在Cd_{3}As_{2} (112) 平面上测量了AHE,专注于超低电子密度膜.
主要成果:
- 在非磁性Cd_{3}As_{2}薄膜中进行了场诱导AHE的量化探测.
- 在平面内磁场旋转时观察到一个明显的三重对称的AHE元件.
- 发现,在超低电子密度膜中,内在的AHE反应得到增强.
结论:
- 在非磁性系统中,磁场诱导的AHE可以有效地使用平面内场旋转来测量.
- 该研究强调了布洛赫波函数在非磁性AHE中的几何性质的重要性.
- 这些发现为研究霍尔反应作为非磁性材料中的轨道磁化开辟了道路.
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