论文标题
蜂窝双层型蜂巢中的对称性破坏对称性的理论实现
Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets
论文作者
论文摘要
我们揭示了蜂窝双层铁磁铁（HBF）中富含木蛋白拓扑，该层间由层间交换，dzyaloshinskii-moriya相互作用（DMI）和静电掺杂（ED）引起。特别是，我们介绍了HBF参数空间中哈密顿非绝热进化的系统研究，该术语（DMI和ED）和Interlayer Exchange跨越了。我们确定带闭合歧管，这些歧管将参数空间划分为六个不同的区域，与五个不同的拓扑阶段和一个拓扑琐事相匹配。为拓扑阶段计算了特征性的Chern数量和热厅电导率。在模型的纳米式版本中，还分析了由散装对应关系决定的边缘光谱。由于ED和边缘镁的结果是在相反的边缘播种，因此发现散装和边缘光谱是非偏射的。预测的结果提供了有关通过实验可调参数操纵镁质Chern数量和镁拓扑传输的新见解。
We reveal the rich magnon topology in honeycomb bilayer ferromagnets (HBF) induced by the combined effect of interlayer exchange, Dzyaloshinskii-Moriya interaction (DMI), and electrostatic doping (ED). In particular, we present a systematic study of the Hamiltonian non-adiabatic evolution in the HBF parametric space, spanned by the symmetry-breaking terms (DMI and ED) and interlayer exchange. We determine the band closure manifolds which are found to divide the parametric space into six distinct regions, matched with five distinct topological phases and one topologically trivial phase. The characteristic Chern numbers and thermal Hall conductivities are calculated for the topological phases. Edge spectra, dictated by the bulk-edge correspondence, are also analyzed in the nanoribbon version of the model. Both bulk and edge spectra are found to be nonreciprocal as a consequence of ED and edge magnons are observed to counter propagate on opposite edges. The predicted results offer new insights on the manipulation of magnonic Chern numbers and magnon topological transport via experimentally tunable parameters.
