Weyl semimetallic state with antiferromagnetic order in Rashba-Hubbard model
arxiv(2024)
摘要
We study the phase diagram of Rashba-Hubbard model by employing the
Hartree-Fock meanfield theory, and thereby establish the existence of an
antiferromagnetically ordered Weyl semimetallic state with in-plane magnetic
moments. This phase is found to be sandwiched in between the antiferromagnetic
insulator and Rashba metal in the interaction vs spin-orbit coupling phase
diagram. The antiferromagnetically-ordered topological semimetallic state
exists in the presence of combined time-reversal and inversion symmetry though
individually both are broken. The study of the static magnetic susceptibility
indicates the robustness of the antiferromagnetic order within a realistic
range of interaction and spin-orbit coupling parameters. In addition to the
edge states associated with the Weyl points, we also investigate the
spin-resolved quasiparticle interference, which provides important insight into
the possible spin texture of the bands especially in the vicinity of Weyl
points.
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