Ferromagnetic Weyl semimetal phase in a tetragonal structure

Article

关键词: TOTAL-ENERGY CALCULATIONS;    AUGMENTED-WAVE METHOD;    TOPOLOGICAL INSULATOR;    ELECTRON-GAS;    BASIS-SET;    STATE;   

DOI  :  10.1103/PhysRevB.96.201102

来源: SCIE

【 摘 要 】

Magnetic topological semimetals have drawn significant interest since they can combine band topology with intrinsic magnetic order. Here, we propose that ideal Weyl semimetal features can coexist with a ferromagnetic (FM) ground state in a class of compounds with centrosymmetric tetragonal structures. In this magnetic system with inversion symmetry, the direction of magnetization is able to manipulate the symmetry protected band structures from a node-line type to a Weyl one in the presence of spin-orbital coupling. The FM node-line semimetal phase is protected by mirror symmetry with the reflection-invariant plane perpendicular to the magnetic order. Within mirror symmetry breaking due to magnetization along other directions, the gapless node-line loop will degenerate to only one pair of Weyl points protected by rotational symmetry along the magnetic axis, which is largely separated in momentum space. Such a FM Weyl semimetal phase offers a nice platform with a minimum number of Weyl points in a condensed matter system. These findings provide several realistic candidates for the investigation of topological semimetals with time-reversal symmetry breaking, especially demonstrating the use of system symmetry as a powerful recipe for discovering FM Weyl semimetals with attractive features.

【 授权许可】

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