论文标题
II型WEYL半法的相互作用引起的相变
Interaction-induced phase transitions of type-II Weyl semimetals
论文作者
论文摘要
Weyl半法（WSM）的研究位于凝结物理学中非平凡拓扑现象的最前沿。在这项工作中，我们研究了现场排斥性哈伯德相互作用对WSM系统的效果，而在半填充时倾斜了。在Hartree-fock平均场近似中，我们以自一度对待Hubbard的相互作用，发现Fock交换场消失了，而Hartree场可以重新化拓扑质量质量，倾斜度和Fermi速度。当重新归一化的倾斜度大于重新归一化的费米速度时，哈伯德相互作用将诱导从类型I WSM到II型WSM的量子相变。然后，我们在不同的参数空间中提供了WSM的相互作用诱导的相图，其中还考虑了在强相互作用处的抗铁磁顺序。此外，我们分析了另一个托管两个Weyl节点的模型，并获得了类似的结果。讨论了这些结果的含义。
The study of Weyl semimetals (WSMs) lies at the forefront of the nontrivial topological phenomena in condensed-matter physics. In this work, we study the effect of on-site repulsive Hubbard interaction on the WSM system with a nonzero tilt at half filling. Within the Hartree-Fock mean-field approximation, we treat the Hubbard interaction self-consistently and find that the Fock exchange field vanishes, while the Hartree field can renormalize the topological mass, the tilt, and the Fermi velocity of the Weyl cones. When the renormalized tilt is larger than the renormalized Fermi velocity, the Hubbard interaction will induce the quantum phase transition from a type-I WSM to a type-II WSM. We then provide the interaction-induced phase diagrams of WSMs in different parametric spaces, in which the antiferromagnetic order at strong interaction is also considered. In addition, we analyze another model hosting two pairs of Weyl nodes, and similar results are obtained. The implications of these results are discussed.
