在Au_{2}Pb中实验实现了三维迪拉克半金属相与可调的利夫希茨过渡
J Sánchez-Barriga1,2, O J Clark1, M G Vergniory1,2,3,4,5
1Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
Physical review letters
|June 24, 2023
概括
研究人员将Au2Pb确定为一个三维的迪拉克半金属. 它的大体迪拉克圆随着温度的变化而变化,这表明由格子压缩和轨道重叠驱动的利夫希茨过渡.
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
- 量子材料是一种量子材料.
背景情况:
- 三维迪拉克半金属由于低能激发而表现出独特的电子特性.
- 了解这些材料对于开发新型电子设备至关重要.
研究的目的:
- 为了研究Au2Pb的电子结构,使用角度分辨光辐射光谱学.
- 确认Au2Pb是一个三维的迪拉克半金属,并分析其温度依赖的行为.
主要方法:
- 在Au2Pb单晶上进行了角度分辨光发射光谱学 (ARPES).
- 为了补充实验观察,进行了理论计算.
- 分析了取决于温度的测量结果,以了解电子结构的演变.
主要成果:
- Au2Pb被证实是一个三维的迪拉克半金属,有一个散装的迪拉克圆.
- 观察到大量迪拉克圆 (超过0.4 eV) 的显著温度诱导的转移,导致了利夫希茨过渡.
- 实验结果与理论计算一致,将转变归因于增强的轨道重叠和晶格压缩.
结论:
- Au2Pb代表了三维迪拉克半金属类中的新材料.
- 格子压缩和增强的轨道重叠驱动观察到的利夫希茨过渡.
- 这项研究揭示了一种控制来自迪拉克点的电子运输贡献的机制,而无需使用兴奋剂.
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