Global phase diagram of disordered type-II Weyl semimetals
Global phase diagram of disordered type-II Weyl semimetals
复制标题
无序 II 型 Weyl 半金属的总体相图
DOI：
10.1103/physrevb.96.024201
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发表时间：
2017
影响因子：
3.7
通讯作者：
Xie X. C.
中科院分区：
文献类型：
--
作者：
Wu Yijia;Liu Haiwen;Jiang Hua;Xie X. C.
由于电子和空穴袋在外尔节点接触，II型外尔半金属是一种新提出的拓扑状态，与I型表兄弟不同。我们数值研究了倾斜的I型和II型Weyl半金属的局域化效应，并给出了全局相图。对于无序的I型Weyl半金属，在Weyl半金属相和扩散金属相之间存在一个中间的三维量子反常Hall相。然而，这种中间相是不存在的无序II型外尔半金属。此外，在Weyl节点附近，与I型Weyl半金属相比，II型Weyl半金属在沿着倾斜方向的输运寿命与量子寿命之比更大.在I型和II型Weyl半金属的相界附近，无限小的无序将诱导出绝缘相，在这个区域，Weyl半金属的概念对真实的材料是没有意义的。
With electron and hole pockets touching at the Weyl node, type-II Weyl semimetal is a newly proposed topological state distinct from its type-I cousin. We numerically study the localization effect for tilted type-I as well as type-II Weyl semimetals and give the global phase diagram. For dis- ordered type-I Weyl semimetal, an intermediate three-dimensional quantum anomalous Hall phase is confirmed between Weyl semimetal phase and diffusive metal phase. However, this intermediate phase is absent for disordered type-II Weyl semimetal. Besides, near the Weyl nodes, comparing to its type-I cousin, type-II Weyl semimetal possesses even larger ratio between the transport lifetime along the direction of tilt and the quantum lifetime. Near the phase boundary between the type-I and the type-II Weyl semimetals, infinitesimal disorder will induce an insulating phase so that in this region, the concept of Weyl semimetal is meaningless for real materials.