Chen M N, Chen W C, Zhou Yu
School of Science, Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China.
Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China.
J Phys Condens Matter. 2021 Oct 28;34(2). doi: 10.1088/1361-648X/ac2ed7.
In this work, we propose a ferromagnetic BiSeas a candidate to hold the coexistence of Weyl- and nodal-line semimetal phases, which breaks the time reversal symmetry. We demonstrate that the type-I Weyl semimetal phase, type-I-, type-II- and their hybrid nodal-line semimetal phases can arise by tuning the Zeeman exchange field strength and the Fermi velocity. Their topological responses under U(1) gauge field are also discussed. Our results raise a new way for realizing Weyl and nodal-line semimetals and will be helpful in understanding the topological transport phenomena in three-dimensional material systems.
在这项工作中，我们提出铁磁BiSe作为一种候选材料，以实现打破时间反演对称性的外尔半金属相和节线半金属相的共存。我们证明，通过调节塞曼交换场强度和费米速度，可以出现I型外尔半金属相、I型、II型及其混合节线半金属相。还讨论了它们在U(1)规范场下的拓扑响应。我们的结果为实现外尔半金属和节线半金属开辟了一条新途径，将有助于理解三维材料系统中的拓扑输运现象。
