TaIrTe4: A ternary type-II Weyl semimetal
TaIrTe4: A ternary type-II Weyl semimetal
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DOI：
10.1103/physrevb.93.201101
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发表时间：
2016-05-05
影响因子：
3.7
通讯作者：
van den Brink, Jeroen
中科院分区：
文献类型：
--
作者：
Koepernik, K.;Kasinathan, D.;van den Brink, Jeroen
在金属凝聚态系统中，原则上可以出现两种不同类型的外尔费米子，要么在外尔节点能量处具有消失的（I型）状态密度，要么具有有限的（II型）状态密度。到目前为止，只有WTe 2和MoTe 2被预测为II型外尔半金属。在这里，我们将TaIrTe 4确定为该拓扑半金属家族的第三个成员。TaIrTe 4具有吸引人的特征，它只有四个分离良好的外尔点，这是对称性所要求的最小值。此外，由此产生的拓扑表面状态-费米弧连接相反手性的Weyl节点-延伸到约1/3的表面布里渊区。这种大的动量空间分离对于费米弧的光谱探测和输运实验是非常有利的。
In metallic condensed matter systems two different types of Weyl fermions can in principle emerge, with either a vanishing (type-I) or with a finite (type-II) density of states at the Weyl node energy. So far only WTe2 and MoTe2 were predicted to be type-II Weyl semimetals. Here we identify TaIrTe4 as a third member of this family of topological semimetals. TaIrTe4 has the attractive feature that it hosts only four well-separated Weyl points, the minimum imposed by symmetry. Moreover, the resulting topological surface states-Fermi arcs connecting Weyl nodes of opposite chirality-extend to about 1/3 of the surface Brillouin zone. This large momentum-space separation is very favorable for detecting the Fermi arcs spectroscopically and in transport experiments.