五层形石墨烯中的轨道多铁性
Tonghang Han1, Zhengguang Lu1, Giovanni Scuri2,3
1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nature
|October 18, 2023
概括
研究人员在五层形石墨烯中发现了一种新型的多铁基材料. 这种材料表现出独特的轨道多铁性,使得电气调节的谷电子和磁性设备具有超低功耗的潜力.
科学领域:
- 凝聚物质物理学
- 材料科学
- 量子力学
背景情况:
- 多铁子表现出自发的旋转,电荷和格子自由度的两极分化,这对于多功能设备至关重要.
- 带有蜂格的二维材料可以实现由轨道自由度驱动的非传统的多铁性,而不是电子自旋.
- 这些材料的铁谷磁性和铁轨磁性提供了强大的谷磁合和对外部场的强烈反应.
研究的目的:
- 为了研究五层形石墨烯的轨道多铁性.
- 探索新的电子和磁性设备应用的潜力.
主要方法:
- 使用低温磁传输测量.
- 观察到异常的霍尔信号 (Rxy) 和轨道磁歇斯底里.
主要成果:
- 在五层形石墨烯中观察到轨道多铁性.
- 检测到异常大的霍尔角 (tanΘH > 0.6) 和轨道磁歇斯底里.
- 一个四个不同的状态的谷磁四重奏被确定,表现出与复合场 E·B 合的铁磁谷电子秩序.
结论:
- 一种以前未知的多铁素已经被证明.
- 这些发现为电调,超低功率的山谷电子和磁性设备铺平了道路.
- 铁性订单的独立切换和多个订单的非挥发性切换是可以实现的.
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