在半金属材料中可调整的大型异常霍尔导电性,由d-波形旋转轨道间隙诱导
Joonyoung Choi1, Jin-Hong Park2, Wonshik Kyung3,4
1Department of Physics, Kyungpook National University, Daegu, 41566, South Korea.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 21, 2024
概括
二硫化物 (CoS2) 与Fe或Ni的注增强了异常的霍尔导电性 (AHC). 这种巨大的AHC源于独特的迪拉克分散,为先进的自旋电子设备和磁传感器提供了潜力.
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:
- 异常霍尔导电性 (AHC) 对自旋电子设备和磁传感器至关重要.
- 二硫化物 (CoS2) 呈现近半金属性和破碎的时间逆转对称性,使其成为高AHC的有希望的材料.
研究的目的:
- 在实证上评估和理解二硫化物 (CoS2) 中异常的霍尔导电性 (AHC).
- 研究Fe (孔) 和Ni (电子) 兴奋剂对CoS2.的AHC的影响.
- 确定对观察到的巨大AHC.负责的潜在物理机制.
主要方法:
- 通过通过Fe和Ni的注来操纵化学潜力的AHC的实证评估.
- 密度函数理论 (DFT) 的计算.
- 紧密结合分析. 紧密结合分析.
主要成果:
- 铁和的注显著增强了CoS2的AHC.
- 在Co0.95Fe0.05S2.2.中实现了2507 Ω-1cm-1的创纪录的AHC.
- 巨大的AHC起源于四个旋转极化的大规模迪拉克分散在kz=0平面的费米水平附近.
结论:
- 这项研究确定了四个旋转极化大规模的迪拉克分散,作为CoS2实质性AHC的主要来源.
- 这些分散的相同的贝里曲率标志,由d波形旋转轨道合驱动,导致记录AHC.
- 这项研究强调了CoS2作为开发高性能自旋电子设备和磁传感器的关键材料.
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