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Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs

机译：拓扑琐碎的单镧镧系元素LaAs中的极端磁致电阻

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摘要

The family of binary lanthanum monopnictides, LaBi and LaSb, has attracted a great deal of attention as it displays an unusual extreme magnetoresistance (XMR) that is not well understood. Two classes of explanations have been offered for this: the presence of nontrivial topology and the compensation between electron and hole densities. Here, by synthesizing a new member of the family, LaAs, and performing transport measurements, angle-resolved photoemission spectroscopy, and density functional theory calculations, we show that (a) LaAs retains all qualitative features characteristic of the XMR effect but with a significant reduction in magnitude compared to LaSb and LaBi, (b) the absence of a band inversion or a Dirac cone in LaAs indicates that topology is insignificant to XMR, (c) the equal number of electron and hole carriers indicates that compensation is necessary for XMR but does not explain its magnitude, and (d) the ratio of electron and hole mobilities is much different in LaAs compared to LaSb and LaBi. We argue that the compensation is responsible for the XMR profile and the mobility mismatch constrains the magnitude of XMR.
机译：二元镧系单金属镧系元素LaBi和LaSb引起了人们的极大关注，因为它表现出一种不为人所知的异常的极端磁致电阻（XMR）。为此提供了两类解释：非平凡拓扑的存在以及电子和空穴密度之间的补偿。在这里，通过合成LaAs族的新成员，并进行传输测量，角度分辨光发射光谱和密度泛函理论计算，我们表明（a）LaAs保留了XMR效应的所有定性特征，但具有显着的与LaSb和LaBi相比强度降低，（b）LaAs中不存在能带反转或Dirac锥表明拓扑对XMR无关紧要，（c）电子和空穴载流子的数量相等表明XMR需要补偿但并不能解释其大小，并且（d）与LaSb和LaBi相比，LaAs中电子迁移率与空穴迁移率的比率差异很大。我们认为，补偿是造成XMR轮廓的原因，而迁移率不匹配会限制XMR的大小。

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  • 来源
    《Physical review》 |2017年第23期|235128.1-235128.7|共7页
  • 作者

    H.-Y. Yang; T. Nummy; H. Li; S. Jaszewski; M. Abramchuk; D. S. Dessau; Fazel Tafti;

  • 作者单位

    Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA;

    Department of Physics, University of Colorado, Boulder, Colorado 80309, USA;

    Department of Physics, University of Colorado, Boulder, Colorado 80309, USA;

    Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA;

    Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA;

    Department of Physics, University of Colorado, Boulder, Colorado 80309, USA;

    Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA;

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