论文标题
武士 - 泽特尔兰晶格的通量状态中的拓扑登胜乐队
The topological magnon bands in the Flux state in Sashtry-Sutherland lattice
论文作者
论文摘要
我们研究了高于非共线通量状态和非旋转状态的低能量木元激发，在海森贝格抗铁磁铁中与dzyaloshinskii-moriya的相互作用〜（DMI）（dmi）在Sashtry-Sashtry-Sustherland晶格上。晶格，我们的结果建立了抗铁磁通量和倾斜态的少镁质的非平凡拓扑。我们的结果揭示了磁杆扇区中多种拓扑相变的存在，这是由单元元素带的变化来证明的，因为哈密顿的参数也会变化，即使基态保持不变。计算了热门电导率，并显示其衍生物在相变处表现出对数差异，而与所涉及的频带接触的类型无关。这可能提供了一种有用的手段来识别过渡发生的能量。最后，我们提出了实现实际材料中研究模型的方式。
We investigate low energy magnon excitations above the non-collinear flux state and non-coplanar canted flux state in a Heisenberg anti-ferromagnet with Dzyaloshinskii-Moriya interaction~(DMI) on a Sashtry-Sutherland lattice.While previous studies have shown the presence of topological magnetic excitation in the dimer and ferromagnetic phases on the Shastry-Sutherland lattice, our results establish the non-trivial topology of magnons in the anti-ferromagnetic flux and canted flux states. Our results uncover the existence of a multitude of topological phase transitions in the magnon sector -- evidenced by the changing Chern numbers of the single magnon bands -- as the Hamiltonian parameters are varied, even when the ground state remains unchanged. The thermal Hall conductivity is calculated and its derivative is shown to exhibit a logarithmic divergence at the phase transitions, independent of the type of band touching involved. This may provide a useful means to identify the energy at which the transition occurs. Finally, we propose the way to realize the studied model in a practical material.
