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Observation of pseudo-two-dimensional electron transport in the rock salt-type topological semimetal LaBi

机译：盐岩型拓扑半金属LaBi中伪二维电子传输的观察

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摘要

Topological insulators are characterized by an inverted band structure in the bulk and metallic surface states on the surface. In LaBi, a semimetal with a band inversion equivalent to a topological insulator, we observe surface-state-like behavior in the magnetoresistance. The electrons responsible for this pseudo-two-dimensional transport, however, originate from the bulk states rather topological surface states, which is witnessed by the angle-dependent quantum oscillations of the magnetoresistance and ab initio calculations. As a consequence, the magnetoresistance exhibits strong anisotropy with large amplitude (~10~5%).
机译：拓扑绝缘体的特征是在表面的块状和金属表面状态下具有倒带结构。在LaBi（一种具有等效于拓扑绝缘体的能带反转的半金属）中，我们观察到了磁阻中的表面状态类似行为。然而，负责这种伪二维传输的电子起源于体态而不是拓扑表面态，这可以通过磁阻的角度相关量子振荡和从头算算得到证明。结果，磁阻表现出大幅度（〜10〜5％）的强各向异性。

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  • 来源
    《Physical review》 |2016年第24期|241106.1-241106.6|共6页
  • 作者

    Nitesh Kumar; Chandra Shekhar; Shu-Chun Wu; Inge Leermakers; Olga Young; Uli Zeitler; Binghai Yan; Claudia Felser;

  • 作者单位

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands;

    High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands;

    High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

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