论文标题
磁性拓扑绝缘子的动力学特性$ t $ bi $ _ {2} $ te $ _ {4} $（$ t = $ t = $ mn，fe）：声子分散，拉曼活动模式和手性声子研究
Dynamical properties of magnetic topological insulator $T$Bi$_{2}$Te$_{4}$ ($T=$Mn, Fe): phonons dispersion, Raman active modes, and chiral phonons study
论文作者
论文摘要
最近发现的磁性拓扑绝缘子$ t $ bi $ _ {2} $ te $ _ {4} $（$ t = $ t = $ mn，fe）结晶成$ r \ bar {3} m $ rhombohedral结构并展示抗fiferromagnetic Order。在这里，我们讨论了这些化合物的晶格动力学，以确认这些系统的稳定性。我们表明，声子色散不包含软模式，因此两种化合物在$ r \ bar {3} m $ phoes中都动态稳定。我们对讨论的化合物对模式活动进行$γ$点的理论分析。在拉曼活动模式的情况下，我们的结果与实验观察到的频率一致。最后，我们还讨论了实现手性声子的可能性。
Recently discovered magnetic topological insulators $T$Bi$_{2}$Te$_{4}$ ($T=$Mn, Fe) crystallize into the $R\bar{3}m$ rhombohedral structure and exhibit the antiferromagnetic order. Here, we discuss the lattice dynamics of these compounds to confirm the stability of these systems. We show that the phonon dispersion does not contain soft modes, so both compounds are dynamically stable in the $R\bar{3}m$ phase. We perform theoretical analyses of the mode activity at $Γ$ point for the discussed compounds. In the case of the Raman active modes, our results are in agreement with the experimentally observed frequencies. Finally, we also discuss the possibility of realization of chiral phonons.
