论文标题
分层的磁绝缘体MN的红外研究（BI $ _ {0.07} $ SB $ _ {0.93} $）$ _ 2 $ _ 2 $ TE $ _4 $在低温下
Infrared study of the layered, magnetic insulator Mn(Bi$_{0.07}$Sb$_{0.93}$)$_2$Te$_4$ at low temperatures
论文作者
论文摘要
具有固有磁性有序的拓扑绝缘子，潜在地托管稀有量子效应，最近引起了广泛的关注。 MNBI $ _2 $ TE $ _4 $是第一个建立的示例。 SB掺杂变体Mn（Bi $ _ {1-x} $ sb $ _x $）$ _ 2 $ _ 2 $ _2 $ _4 $显示出大量的电子属性，具体取决于SB内容〜$ x $，例如Fermi级别的变化，例如Fermi级别的变化和Neel温度$ t _ {高SB替代比。在这里，我们研究了磁性订购对MN的批量电子结构的影响（Bi $ _ {1-X} $ SB $ _X $）$ _ 2 $ _ 2 $ TE $ _4 $带有高SB内容$ x = 0.93 $，依赖温度依赖的反射率测量值在广泛频率范围内。当抗铁磁顺序集合时，我们观察到$ t _ {\ mathrm n} $的光学响应中的异常，这表明磁性排序与材料的电子结构之间的耦合。
Topological insulators with intrinsic magnetic ordering, potentially hosting rare quantum effects, recently attracted extensive attention. MnBi$_2$Te$_4$ is the first established example. The Sb-doped variant Mn(Bi$_{1-x}$Sb$_x$)$_2$Te$_4$ shows a great variety of electronic properties depending on the Sb content~$x$, such as shifts in the Fermi level and the Neel temperature $T_{\mathrm N}$, and the change of the free charge carrier type from $n$- to $p$-type at high Sb substitution ratios. Here, we investigate the effect of magnetic ordering on the bulk electronic structure of Mn(Bi$_{1-x}$Sb$_x$)$_2$Te$_4$ with high Sb content $x=0.93$ by temperature-dependent reflectivity measurements over a broad frequency range. We observe anomalies in the optical response across $T_{\mathrm N}$ when the antiferromagnetic order sets, which suggests a coupling between the magnetic ordering and the electronic structure of the material.
