论文标题
拓扑结晶器中具有巨大磁矩的手性声子
Chiral Phonons with Giant Magnetic Moments in a Topological Crystalline Insulator
论文作者
论文摘要
我们已经研究了pb $ _ {1-x} $ sn $ _ {x} $ te films中横向光学声子的磁响应。依赖极化的Terahertz磁光谱测量结果揭示了Zeeman分裂和磁磁性移位，表明这些声子模式在磁场上成为手性。拓扑结晶绝缘子相（$ x> 0.32 $）中的膜表现出比两个数量级的磁矩值大于拓扑薄膜（$ x <0.32 $）的磁矩值。此外，有效的$ g $因子的迹象在两个阶段相反，这可以通过我们的理论模型来解释。这些结果强烈表明手性声子的磁性特性与电子带结构的拓扑之间存在相互作用。
We have studied the magnetic response of transverse optical phonons in Pb$_{1-x}$Sn$_{x}$Te films. Polarization-dependent terahertz magnetospectroscopy measurements revealed Zeeman splittings and diamagnetic shifts, demonstrating that these phonon modes become chiral in magnetic fields. Films in the topological crystalline insulator phase ($x > 0.32$) exhibited magnetic moment values that are larger than those for topologically trivial films ($x < 0.32$) by two orders of magnitude. Furthermore, the sign of the effective $g$-factor was opposite in the two phases, which can be explained by our theoretical model. These results strongly indicate the existence of interplay between the magnetic properties of chiral phonons and the topology of electronic band structure.
