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Absence of Dirac states in BaZnBi_2 induced by spin-orbit coupling

机译：自旋轨道耦合引起BaZnBi_2中狄拉克态的缺乏

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摘要

We report magnetotransport properties of BaZnBi_2 single crystals. Whereas electronic structure features Dirac states, such states are removed from the Fermi level by spin-orbit coupling (SOC) and consequently electronic transport is dominated by the small hole and electron pockets. Our results are consistent with not only three-dimensional, but also with quasi-two-dimensional portions of the Fermi surface. The SOC-induced gap in Dirac states is much larger when compared to isostructural SrMnBi_2. This suggests that not only long-range magnetic order, but also mass of the alkaline-earth atoms A in ABX_2 (A = alkaline-earth, B = transition-metal, and X = Bi/Sb) are important for the presence of low-energy states obeying the relativistic Dirac equation at the Fermi surface.
机译：我们报告BaZnBi_2单晶的磁输运性质。尽管电子结构具有狄拉克状态，但通过自旋轨道耦合（SOC）将这些状态从费米能级中移除，因此，电子传输主要由小空穴和电子袋占据。我们的结果不仅与费米表面的三维，而且与准二维部分一致。与同构SrMnBi_2相比，SOC在Dirac状态下产生的间隙要大得多。这表明ABX_2中的碱土原子A不仅是远距离磁序，而且其质量（A =碱土，B =过渡金属，X = Bi / Sb）对于低铁的存在也很重要。能量状态服从费米表面的相对论狄拉克方程。

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  • 来源
    《Physical review》 |2018年第3期|035147.1-035147.5|共5页
  • 作者

    Weijun Ren; Aifeng Wang; D. Graf; Yu Liu; Zhidong Zhang; Wei-Guo Yin; C. Petrovic;

  • 作者单位

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA,Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

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