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arXiv 2211.02456cond-mat.mtrl-scicond-mat.mes-hallphysics.comp-ph
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三维TmBi化合物的结构、电子和拓扑性质

Structural, electronic and topological properties of 3D TmBi compound

M. Ragragui, L. B. Drissi, S. Lounis, E. H. Saidi

摘要:

利用密度泛函理论研究了面心立方晶体TmBi的结构、电子和拓扑性质。这种材料被发现是动态稳定的,并显示出非磁性半金属字符。通过调节自旋-轨道耦合,我们观察到能带结构的显著变化,以及沿$Γ-X$方向的能带反转的发生。时反不变动量点的宇称积和Wannier电荷中心计算提供了$k_{j}=0$平面上的拓扑指数$Z_{2}=1$(具有$j=1,2$和$3$),揭示了TmBi的非平凡拓扑特征。通过在$\bar{X}$点上对狄拉克锥的观测,证明了TmBi的拓扑保护表面态的存在.目前的工作可以激发平台,探索新的拓扑状态的家庭内的稀土单铋化物。

英文摘要:

Using density functional theory based methods we report the structural, electronic and topological properties of the FCC crystal compound TmBi. This material is found to be dynamically stable and shows a non magnetic semimetalic character. By tuning the spin-orbit coupling, we observe a significant change in the band structure, and the occurrence of band inversion along $Γ-X$ direction. The parity product at time-reversal invariant momentum points and the Wannier charge center calculations provide a topological index $Z_{2}=1$ on the $k_{j}=0$ plane (with $j=1,2$ and $3$) revealing the non trivial topological character of TmBi. The existence of topologically protected surface states of TmBi through the observation of a Dirac cones at $\bar{X}$ point confirm our finding. The present work could inspire platforms for exploring novel topological states within the family of rare-earth monobismuthides.

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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