磁振子三阶退化节点
Magnonic triply-degenerate nodal points
摘要：
我们推广的概念，三重简并节点的非共线反铁磁体。在这里，我们介绍这个概念，绝缘量子反铁磁体的装饰蜂窝晶格，自旋$1$玻色子准粒子激发称为磁振子。我们证明了存在的磁振子表面状态与恒定的能量轮廓，形成对磁振子弧连接的磁振子三节点的表面投影。准粒子的激发附近的三个节点代表三个组件玻色子超越了磁狄拉克，外尔，和螺旋线的情况下。它们可以被看作是磁振子携带的内禀自旋的直接反映。此外，我们表明，磁振子三结点可以分裂成磁振子Weyl点，作为系统从一个非共线的自旋结构过渡到一个非共面的一个非零标量自旋手征。我们的结果不仅适用于绝缘反铁磁体，也为寻找金属反铁磁体中的三重结点提供了一个平台。
英文摘要：
We generalize the concept of triply-degenerate nodal points to non-collinear antiferromagnets. Here, we introduce this concept to insulating quantum antiferromagnets on the decorated honeycomb lattice, with spin-$1$ bosonic quasiparticle excitations known as magnons. We demonstrate the existence of magnonic surface states with constant energy contours that form pairs of magnonic arcs connecting the surface projection of the magnonic triple nodal points. The quasiparticle excitations near the triple nodal points represent three-component bosons beyond that of magnonic Dirac, Weyl, and nodal-line cases. They can be regarded as a direct reflection of the intrinsic spin carried by magnons. Furthermore, we show that the magnonic triple nodal points can split into magnonic Weyl points, as the system transits from a non-collinear spin structure to a noncoplanar one with a nonzero scalar spin chirality. Our results not only apply to insulating antiferromagnets, but also provide a platform to seek for triple nodal points in metallic antiferromagnets.
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