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Chiral wave-packet scattering in Weyl semimetals

机译：Weyl半金属中的手性波包散射

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摘要

In quantum mechanics, a particle is best described by the wave packet instead of the plane wave. Here, we study the wave-packet scattering problem in Weyl semimetals with the low-energy Weyl fermions of different chiralities. Our results show that the wave packet acquires a chirality-protected shift in the single-impurity scattering process. More importantly, the chirality-protected shift can lead to an anomalous scattering probability, and thus affects the transport properties in Weyl semimetals. We find that the ratio between the transport lifetime and the quantum lifetime increases sharply when the Fermi energy approaches the Weyl nodes, providing an explanation of the experimentally observed ultrahigh mobility in topological (Weyl or Dirac) semimetals.
机译：在量子力学中，最好用波包而不是平面波来描述粒子。在这里，我们研究了具有不同手性的低能Weyl费米原子的Weyl半金属中的波包散射问题。我们的结果表明，波包在单杂质散射过程中获得了手性保护位移。更重要的是，受手性保护的移位会导致异常散射概率，从而影响Weyl半金属的传输性能。我们发现，当费米能量接近Weyl节点时，传输寿命与量子寿命之间的比率急剧增加，这为在拓扑（Weyl或Dirac）半金属中实验观察到的超高迁移率提供了解释。

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  • 来源
    《Physical review》 |2016年第19期|195165.1-195165.12|共12页
  • 作者

    Qing-Dong Jiang; Hua Jiang; Haiwen Liu; Qing-Feng Sun; X. C. Xie;

  • 作者单位

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China;

    College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, People's Republic of China;

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China,Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China,Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, People's Republic of China;

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China,Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China;

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China,Collaborative Innovation Center of Quantum Matter, Beijing 100871, People's Republic of China;

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