阶段过渡,迪拉克和韦尔半金属状态在Mn1-xGexBi2Te4中
A M Shikin1, N L Zaitsev2,3, T P Estyunina2
1Saint Petersburg State University, St. Petersburg, 198504, Russia. ashikin@inbox.ru.
Scientific reports
|January 11, 2025
概括
本研究探讨了在拓绝缘体中用替换如何影响其电子结构. 增加的度缩小了带间隙,影响了表面状态,可能使磁性韦尔半金属状态成为可能.
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:
- 拓绝缘器 (TI) 具有独特的电子特性,在旋电学和量子计算中具有潜在的应用.
- 了解信息技术中电子带结构的可调性对于设计新型量子材料至关重要.
- 磁性和拓之间的相互作用可以导致像韦尔半金属这样的异国情境.
研究的目的:
- 为了研究TI中用非磁性Ge原子替换磁性Mn原子对其电子结构的影响.
- 分析能量频段间隙和表面状态的变化,作为Ge度的函数.
- 探索在不同条件下形成磁性韦尔半金属状态的潜力.
主要方法:
- 使用角度分辨率光发射谱学 (ARPES) 进行实验性表征.
- 使用密度函数理论 (DFT) 进行理论计算.
- 系统地改变Ge度 (10%至75%),探索磁性排序 (AFM/FM),旋转轨道合 (SOC) 和应变.
主要成果:
- 增加 Ge 度会导致散带间隙的减少,在 45-60% 的 Ge 之间达到零.
- 微不足道的表面状态 (TrSS) 呈现能量分裂,在40%的Ge度附近消失.
- DFT计算预测了AFM和FM排序的不同拓相过渡 (TPT),FM相允许维尔半金属状态.
结论:
- 电子结构和TI的带间隔 [公式:参见文本]是通过Ge替换高度调节的.
- 在这个系统中,可以实现磁性韦尔半金属状态,特别是在FM订单和特定的兴奋剂水平下.
- 该研究揭示了通过控制磁顺序和材料参数来实现不同拓阶段的途径.
关键词:
阿尔佩斯 (ARPES) 是一个名为"阿尔佩斯"的游戏.在 DFT 方面,它是最重要的.磁拓绝缘体是一种磁性绝缘体.在 MnBi2Te4 的基础上.韦尔半金属是一种半金属.兴奋剂的使用 兴奋剂的使用更多相关视频
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