论文标题
在高场的Kitaev磁铁中，具有有限的Dzyaloshinskii-Moriya相互作用
Topological magnons in Kitaev magnets with finite Dzyaloshinskii-Moriya interaction at high field
论文作者
论文摘要
为了实现诸如量子自旋液体和拓扑秩序之类的外来状态，已经进行了有关基塔夫材料的深入研究。在逼真的材料中，基塔夫相互作用可能与dzyaloshinskii-moriya相互作用（DMI）共存，并且分别区分它们的幅度是一个挑战。在这里，我们研究了暴露在磁场上的海森贝格，基塔维尔和DM相互作用的kagome磁铁的拓扑磁化激发和相关的热门电导率。在垂直于晶格平面（[111]方向）的强磁场中，将系统带入完全极化的顺磁性相，我们发现镁带在相图的整个区域中携带非平凡的Chern数字。此外，存在相变的两个拓扑阶段与相反的Chern数字，这导致了热厅电导率的符号变化。在具有负电导率的相位，基塔夫相互作用相对较大，并且相位的宽度随DMI强度而增加。因此，这里的研究将有助于理解相关化合物。
There have been intensive studies on Kitaev materials for the sake of the realization of exotic states such as quantum spin liquid and topological orders. In realistic materials, the Kitaev interaction may coexist with the Dzyaloshinskii-Moriya interaction (DMI), and it is a challenge to distinguish their magnitudes separately. Here, we study the topological magnon excitations and related thermal Hall conductivity of kagome magnet exhibiting Heisenberg, Kitaev and DM interactions exposed to a magnetic field. In a strong magnetic field perpendicular to the plane of the lattice ([111] direction) that bring the system into the fully polarized paramagnetic phase, we find that the magnon bands carry nontrivial Chern numbers in the full region of the phase diagram. Furthermore, there are phase transitions relate two topological phases with opposite Chern numbers, which lead to the sign changes of the thermal Hall conductivity. In the phase with negative thermal conductivity, the Kitaev interaction is relatively large and the width of the phase increases with the strength of DMI. Hence the study here will contribute to the understanding of related compounds.
