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首页> 外文期刊>Physical review >Quantum oscillations and magnetoresistance in type-Ⅱ Weyl semimetals: Effect of a field-induced charge density wave
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Quantum oscillations and magnetoresistance in type-Ⅱ Weyl semimetals: Effect of a field-induced charge density wave

机译：Ⅱ型魏尔半金属的量子振动和磁阻：场致电荷密度波的影响

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摘要

Recent experiments on type-Ⅱ Weyl semimetals such as WTe_2, MoTe_2, Mo_xW_(1-x)Te_2, and WP_2 reveal remarkable transport properties in the presence of a strong magnetic field, including an extremely large magnetoresistance and an unusual temperature dependence. Here, we investigate magnetotransport via the Kubo formula in a minimal model of a type-Ⅱ Weyl semimetal taking into account the effect of a charge density wave (CDW) transition, which can arise even at weak coupling in the presence of a strong magnetic field because of the special Landau level dispersion of type-Ⅱ Weyl systems. Consistent with experimental measurements we find an extremely large magnetoresistance with close to B~2 scaling at particle-hole compensation, while in the extreme quantum limit there is a transition to a qualitatively new scaling with approximately B~(0.75). We also investigate the Shubnikov-de Haas effect and find that the amplitude of the resistivity quantum oscillations are greatly enhanced below the CDW transition temperature which is accompanied by an unusual nonmonotonous (non-Lifshitz-Kosevich) temperature dependence.
机译：最近对诸如WTe_2，MoTe_2，Mo_xW_（1-x）Te_2和WP_2的WeylⅡ型半金属进行的实验表明，在强磁场存在下，其传输性能非常出色，包括极大的磁阻和不寻常的温度依赖性。在这里，我们考虑到电荷密度波（CDW）跃迁的影响，通过Kubo公式在Ⅱ型Weyl半金属的最小模型中研究了磁传输，即使在强磁场存在下弱耦合也可能产生由于Ⅱ型Weyl系统具有特殊的Landau能级色散。与实验测量结果一致，我们发现在粒子孔补偿时具有接近B〜2标度的极大的磁阻，而在极端的量子极限下，过渡到定性的新标度，其近似为B〜（0.75）。我们还研究了Shubnikov-de Haas效应，发现在CDW转变温度以下，电阻率量子振荡的幅度大大增强，这伴随着异常的非单调（非Lifshitz-Kosevich）温度依赖性。

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  • 来源
    《Physical review》 |2018年第12期|125304.1-125304.9|共9页
  • 作者

    Maximilian Trescher; Emil J. Bergholtz; Johannes Knolle;

  • 作者单位

    Dahlem Center for Complex Quantum Systems and Institut fur Theoretische Physik, Freie Universitdt Berlin, Arnimallee 14, 14195 Berlin, Germany;

    Department of Physics, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden;

    Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom;

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