Chiral wave-packet scattering in Weyl semimetals
Chiral wave-packet scattering in Weyl semimetals
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DOI：
10.1103/physrevb.93.195165
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发表时间：
2016-01
影响因子：
3.7
通讯作者：
Qing-Dong Jiang;Hua Jiang;Haiwen Liu;Qing-feng Sun;X. Xie
中科院分区：
文献类型：
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作者：
Qing-Dong Jiang;Hua Jiang;Haiwen Liu;Qing-feng Sun;X. Xie
在量子力学中，粒子最好用波包而不是平面波来描述。在这里，我们研究具有不同手性的低能韦尔费米子的韦尔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的位移。更重要的是，手性保护的位移会导致异常散射概率，从而影响外尔半金属的输运特性。我们发现，当费米能量接近韦尔节点时，输运寿命与量子寿命之间的比率急剧增加，这为实验观察到的拓扑（韦尔或狄拉克）半金属中的超高迁移率提供了解释。
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.