Helical Fermi arcs and surface states in time-reversal invariant Weyl semimetals
Helical Fermi arcs and surface states in time-reversal invariant Weyl semimetals
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DOI：
10.1103/physrevb.87.245112
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发表时间：
2013-06-17
影响因子：
3.7
通讯作者：
Ojanen, Teemu
中科院分区：
文献类型：
--
作者：
Ojanen, Teemu
Weyl半金属是一种无间隙的三维拓扑材料，其中两个带在布里渊带的偶数点上接触。本文研究了一种实现时间反转不变Weyl半金属的锌-闪锌矿晶格模型。体动力学用12个螺旋Weyl节点来描述。表面态形成一种特殊的准二维螺旋金属，与拓扑绝缘体典型的狄拉克形式根本不同。低能表面激发的速度和自旋允许方向锁定在三次对称轴上。所研究的体系说明了具有常见晶体对称性体系中表面态的一般性质。
Weyl semimetals are gapless three-dimensional topological materials where two bands touch at an even number of points in the Brillouin zone. In this work we study a zinc-blende lattice model realizing a time-reversal invariant Weyl semimetal. The bulk dynamics is described by 12 helical Weyl nodes. Surface states form a peculiar quasi-two-dimensional helical metal fundamentally different from the Dirac form typical for topological insulators. The allowed direction of velocity and spin of low-energy surface excitations are locked to the cubic symmetry axes. The studied system illustrates the general properties of surface states in systems with common crystal symmetries.