在一个单原子厚的GdYb1-Pb3Kagome化合物中的Lifshitz过渡在Si上(111)
Yuriy E Vekovshinin1, Leonid V Bondarenko1, Alexandra Y Tupchaya1
1Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia.
Nano letters
|August 5, 2024
概括
上的兰-化合物 (LnPb3) 表现出可调节的电子特性. 对这些二维材料的费米水平位置的精确控制使得物理特征的显著变化成为可能,包括板材的阻力.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 表面科学是一门学科.
背景情况:
- 兰化物 (Ln) 元素,如加多 (Gd) 和亚铁 (Yb),可以与 (Si) 上的 (Pb) 单层合金 (Si111).
- 这些合金形成LnPb3化合物,具有独特的晶体结构,具有六角空隙中的Pb层和Ln原子.
研究的目的:
- 为了研究LnPb3化合物的电子带结构和费米水平可调性.
- 探索费尔米水平控制与物理性质变化之间的关系,特别是板材阻力.
主要方法:
- 在Si(111) 基板上合成2D LnPb3化合物.
- 晶体结构和电子带结构的表征.
- 调查费米水平变化及其对物理性质的影响.
主要成果:
- LnPb3化合物表现出类似的电子带结构,Yb和Gd含有系统之间的费米水平差异高达~0.47 eV.
- 一个2D固体溶液允许通过调整Gd/Yb比率来精确控制费米水平.
- 费米水平的变化引发了利夫希茨过渡,大大改变了费米表面拓和物理性质.
结论:
- 在Gd-Yb-Pb/Si{111) 系统中可调节的费米水平为工程材料特性提供了一条途径.
- 板电阻可以通过操纵费米水平位置来可控地在一个数量级上变化.
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