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首页> 外文期刊>Physical review >Resonant impurity states in chemically disordered half-Heusler Dirac semimetals
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Resonant impurity states in chemically disordered half-Heusler Dirac semimetals

机译：化学无序的半Heusler Dirac半金属中的共振杂质态

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摘要

We address the electron transport characteristics in bulk half-Heusler alloys with their compositions tuned to the borderline between topologically nontrivial semimetallic and trivial semiconducting phases. Accurate first-principles calculations based on the coherent potential approximation (CPA) reveal that all the studied systems exhibit sets of dispersionless impurity-like resonant levels, with one of them being located at the Dirac point. By means of the Kubo-Bastin formalism we reveal that the residual conductivity of these alloys is strongly suppressed by impurity scattering, whereas the spin Hall conductivity exhibits a rather complex behavior induced by the resonant states. In particular for LaPt_(0.5)Pd_(0.5)Bi we find that the total spin Hall conductivity is strongly suppressed by two large and opposite contributions: the negative Fermi-surface contribution produced by the resonant impurity and the positive Fermi-sea term stemming from the occupied states. At the same time, we identify no conductivity contributions from the conical states.
机译：我们解决了大体积半霍斯勒合金的电子传输特性，其组成调整到拓扑非平凡的半金属相和平凡的半导体相之间的边界。基于相干势近似（CPA）的准确的第一性原理计算表明，所有研究的系统均表现出无色散样的共振水平集，其中一组位于狄拉克点。通过Kubo-Bastin形式主义，我们揭示了这些合金的残留电导率被杂质散射强烈抑制，而自旋霍尔电导率则表现出由共振态引起的相当复杂的行为。特别是对于LaPt_（0.5）Pd_（0.5）Bi，我们发现总的自旋霍尔电导率受到两个较大且相反的贡献的强烈抑制：共振杂质产生的负费米表面贡献和源自于杂质的正费米海项被占领的国家。同时，我们没有发现锥形状态的电导率贡献。

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  • 来源
    《Physical review》 |2016年第19期|195102.1-195102.7|共7页
  • 作者

    K. Chadova; D. Koedderitzsch; J. Minar; H. Ebert; J. Kiss; S. W. DSouza; L. Wollmann; C. Felser; S. Chadov;

  • 作者单位

    Department Chemie, Ludwig-Maximilians-Universitaet, Butenandtstrasse 11, 81377 Muenchen, Germany;

    Department Chemie, Ludwig-Maximilians-Universitaet, Butenandtstrasse 11, 81377 Muenchen, Germany;

    Department Chemie, Ludwig-Maximilians-Universitaet, Butenandtstrasse 11, 81377 Muenchen, Germany;

    Department Chemie, Ludwig-Maximilians-Universitaet, Butenandtstrasse 11, 81377 Muenchen, Germany;

    Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden, Germany;

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