调查可能的单层室温拓绝缘体的第一原则
1National Graphene Research and Development Center Springfield Virginia 22151 USA.
RSC advances
|October 30, 2023
概括
我们发现了新的量子旋转厅 (QSH) 绝缘体,TlPF2和TlAsF2,具有适用于室温应用的大带间隙. 这些材料显示出量子计算和自旋电子学的潜力.
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:
- 量子旋转厅 (QSH) 绝缘体是先进电子产品的关键,因为它们具有独特的拓性质和大带间隙.
- 化学功能化是一种有前途的策略,用于设计具有可调节特性的QSH绝缘体.
- 开发用于室温应用的材料对于实际的技术进步至关重要.
研究的目的:
- 为了研究实现量子旋转厅效应的新型功能化单层.
- 探索 TlPX2, TlAsX2, GaGeTe, InGeTe 和 InSnTe 系统的拓性质和电子带结构.
- 为了确定有希望的2D拓绝缘体 (TI) 具有大批量带间隙的潜在应用.
主要方法:
- 使用ABINIT套件进行第一原则电子结构计算.
- 计算了Z2拓不变量,以验证研究材料的拓性质.
- 分析了各种功能化单层的散带间隙和电子特性.
主要成果:
- 确定了 TlPF2, TlPCl2, TlPBr2, TlPI2, TlAs, TlAsF2, TlAsCl2, TlAsBr2 和 TlAsI2 作为有希望的二维拓绝缘体.
- 在这些新的二维TI中发现了高达0.21 eV的大批量带间隙.
- 证实了这些单层对室温应用的适用性.
结论:
- 研究的功能化TLP和TLAs单层是2D拓绝缘体的优秀候选者.
- 这些材料在量子计算机,纳米电子和自旋电子学中的应用具有显著的潜力.
- 这些发现为设计利用拓性质的下一代电子设备铺平了道路.
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