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arXiv 2201.00294cond-mat.mtrl-scicond-mat.mes-hall
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探索NiTe₂中的本征原子缺陷

Exploring Native Atomic Defects in NiTe2

Hebei Normal University(河北师范大学);Beijing Information Science and Technology University(北京信息科技大学);Songshan Lake Materials Laboratory(松山湖材料实验室);Zhejiang University of Technology(浙江工业大学)

Wen-Xiao Wang, Kaihui Li, Xiaoshan Dong, Hao Xie, Jinglan Qiu, Chunqiang Xu, Kai Liu, Juntao Song, Yi-Wen Wei, Ke-Ke Bai, Xiaofeng Xu, Ying Liu

AI总结:

研究NiTe₂中的本征原子缺陷,通过高分辨率扫描隧道显微镜与第一性原理计算,发现五种主要缺陷类型,揭示生长条件对缺陷类型的影响,并提出通过控制合成条件来调控缺陷以优化材料电子性质。

摘要:

镍二碲化物(NiTe₂),一种新发现的II型狄利克雷半金属,其狄利克雷节点接近费米能级,预计会表现出包括里施茨转变和超导在内的异常现象。作为过渡金属二硫化物,缺陷不可避免且对光学和电子性质有显著影响。然而,对NiTe₂中缺陷的系统研究仍不足。本文通过高分辨率扫描隧道显微镜结合第一性原理计算,系统研究了NiTe₂中的点缺陷,包括空位、掺杂和反位缺陷。我们识别出五种主要本征缺陷类型,并揭示生长条件会影响本征缺陷类型。通过控制合成过程中原料比例,可以操控点缺陷类型,特别是反位缺陷。此外,我们发现本征缺陷可略微掺杂拓扑表面态。本研究为未来优化NiTe₂及其他相关材料的电子性质提供了简便方法。

英文摘要:

Nickel ditelluride (NiTe2), a new discovered type-II Dirac semimetal whose Dirac node lies close to its Fermi level, is expected to exhibit exotic phenomena including Lifshitz transition and superconductivity. As we know, defects are inevitable for transition metal dichalcogenides and have significant impacts on the optical and electronic properties. However, the systematic study of defects in NiTe2 is still lack. Here, by using high-resolution scanning tunneling microscopy combined with first-principles calculations, the point defects including the vacancy, intercalation and antisite defects in NiTe2 are systematically investigated. We identified five main types native defects and revealed that the growth condition could affect the type of native defects. By controlling the ratio of ingredient during synthesis, the types of point defects are expected to be manipulated, especially antisite defects. Additionally, we find native defects could slightly dope the topological surface states. Our results provide a facile way to manipulate defects for future optimizing the electronic properties of NiTe2 and other related materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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