在二维金属有机框架中实现高阶拓相变
Yefeng Li1, Tingli He1, Min Zhao1
1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China.
Journal of physics. Condensed matter : an Institute of Physics journal
|September 25, 2023
概括
二维金属有机框架使可控制的拓相变成为可能. 研究人员在这些材料中证明了常规和更高阶拓量子态之间的应变诱导的转移.
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
- 量子化学 是一个量子化学.
背景情况:
- 在二维材料中,在常规状态和更高阶状态之间实现可控的拓相过渡仍然是一个重大挑战.
- 金属有机框架 (MOF) 具有可调节的电子特性,使其成为探索新型拓现象的有希望的候选人.
研究的目的:
- 调查二维MOF实现可控制的拓相变的潜力.
- 确定特定的MOF候选物,并描述它们在应变下的拓性质.
主要方法:
- 用第一原理计算来研究二维MOF候选者的电子带结构和拓性质.
- 压力和拉力应变对拓阶段的影响被系统地分析.
主要成果:
- 二维MOF候选物Pd3(C6S6)2在平衡状态下表现出半金属带结构,在压力应变下转换为二级拓绝缘体 (SOTI).
- 拉力应变诱导从SOTI到双韦尔半金属 (DWSM) 的拓相过渡,其特点是切尔恩数的变化.
- 在临界点的系统表现为一个二维的伪旋转-1费米子.
- 铁磁Fe3(C6S6)2也显示了一个DWSM-to-SOTI过渡与自旋极化拓状态.
结论:
- 2D MOF是实现常规状态和更高阶状态之间可控制的拓相过渡的理想平台.
- 这项工作首次在非磁性和磁性MOF中实现了这种过渡,为拓材料设计开辟了新的途径.
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