在扭曲的相互交织的石墨烯螺旋中,极大的电磁阻
Yiwen Zhang1,2, Bo Xie1,2, Yue Yang1
1School of Physical Science and Technology, ShanghaiTech University, Shanghai, China.
Nature communications
|July 20, 2024
概括
在一个新的3D扭曲石墨烯螺旋系统中观察到极大的电磁阻 (XMR). 这一发现突显了工程摩埃尔系统在先进的自旋电子应用中的潜力.
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:
- 极大的磁电阻 (XMR) 对磁传感器和内存等自旋电子设备至关重要.
- XMR通常发生在具有高导电性和电子孔对称性的韦尔半金属中.
- 石墨烯moiré系统为探索拓现象提供了一个新的平台.
研究的目的:
- 在新开发的三维交织扭曲石墨烯螺旋 (TGS) 系统中研究XMR.
- 了解拓结构和晶体质量的作用,以实现XMR.
- 探索TGS的电子特性和潜在应用.
主要方法:
- 通过操纵螺杆位移轴,制造具有特定旋转角度 (7.3°) 的3DTGS.
- 在不同的磁场 (高达14 T) 和温度 (低至2 K) 中测量磁阻.
- 在TGS系统中分析电子特性和相位过渡.
主要成果:
- 在14T和2K时实现了1.7×107%的前所未有的磁阻.
- 观察到温度诱导的金属绝缘器过渡,由0.1 T以上的磁场触发.
- 建议TGS系统的3D兰道层存在复杂的,相关的状态.
结论:
- 在二维分层moiré系统中设计的拓结构可以导致XMR.
- 3D TGS 系统表现出了显著的磁电阻特性,有可能用于自旋电子设备.
- 对3Dmoiré系统中相关状态的进一步研究是有必要的.
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