The ternary AMnBi_{2} (A is alkaline as well as rare-earth atom) materials provide an arena for investigating the interplay between low-dimensional magnetism of the antiferromagnetic MnBi layers and the electronic states in the intercalated Bi layers, which harbor relativistic fermions. Here, we report on a comprehensive study of the optical properties and magnetic torque response of Ca_{1-x}Na_{x}MnBi_{2}. Our findings give evidence for a spin canting occurring at T_{s}∼50-100  K. With the support of first-principles calculations we establish a direct link between the spin canting and the reconstruction of the electronic band structure, having immediate implications for the spectral weight reshuffling in the optical response, signaling a partial gapping of the Fermi surface, and the dc transport properties below T_{s}.

中文翻译：

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狄拉克材料Ca_ {1-x} Na_ {x} MnBi_ {2}中自旋引起的能带重构。

三元AMnBi_ {2}（A是碱性原子以及稀土原子）材料为研究反铁磁MnBi层的低维磁性与插层Bi层中的电子态之间的相互作用提供了场所，Bi层中包含相对论性费米子。在这里，我们对Ca_ {1-x} Na_ {x} MnBi_ {2}的光学性质和磁转矩响应进行了全面研究。我们的发现提供了在T_ {s}〜50-100 K处发生自旋倾斜的证据。在第一性原理计算的支持下，我们在自旋倾斜与电子能带结构的重建之间建立了直接联系，对光学响应中的光谱权重转换，表明费米表面出现了部分缺口，并且直流传输特性低于T_ {s}。