Topological phases in aWeyl semimetal multilayer

Article

关键词: QUANTUM SPIN HALL;    WEYL FERMION;    TRANSITION;    DISCOVERY;    NODES;    ARCS;   

DOI  :  10.1103/PhysRevB.95.155101

来源: SCIE

【 摘 要 】

We investigate multilayers of a normal insulator and a Weyl semimetal using two models: an effective model and a lattice model. As a result, we find that the behavior of the multilayers is qualitatively different depending on the stacking direction relative to the displacement vector between the Weyl nodes. When the stacking direction is perpendicular to the displacement vector between the Weyl nodes, the system shows either the normal insulator or the Weyl semimetal phases depending on the thicknesses of the two layers. In contrast, when the stacking direction is parallel to that, the phase diagram is rich, containing the normal insulator phase, the Weyl semimetal phase, and the quantum anomalous Hall phases with various values of the Chern number. As a superlattice period increases, the Chern number in the quantum anomalous Hall phases increases. Thus, one can design a quantum anomalous Hall system with various Chern numbers in a multilayer of a Weyl semimetal and a normal insulator. Applications to Weyl semimetal materials are discussed.

【 授权许可】

Free