论文标题
Mnbi $ _ {2-x} $ sb $ _ {x} $ te $ _ {4} $中的量子振荡MNBI $ _ {2-x} $ _ {2-x} $ _ {2-x} $
Quantum Oscillations in the Field-induced Ferromagnetic State of MnBi$_{2-x}$Sb$_{x}$Te$_{4}$
论文作者
论文摘要
固有的抗磁性拓扑绝缘子MNBI $ _ {2} $ te $ _ {4} $在C轴磁场中经历了元磁过渡。据预测，铁磁Mnbi $ _ {2} $ te $ _ {4} $是一对Weyl节点的理想的Weyl Semimetal。在这里，我们报告了Mnbi $ _ {2-x} $ sb $ _ {x} $ te $ _ {4} $的MNBI $ _ {2-x} $ _ {2-x} $ _ {4} $的量子振荡的测量值，其中SB替代将多数载体从电子转到孔中。单频Shubnikov-de HAAS振荡以广泛的SB浓度（0.54 $ \ leq $ x $ \ leq $ 1.21）观察到。振荡频率和有效质量的演变与铁磁Mnbi $ _ {2} $ te $ _ {4} $通过密度功能计算预测的Weyl Semimetal带结构的合理一致。有趣的是，量子振荡频率显示出强烈的温度依赖性，表明电子结构敏感地取决于磁性。
The intrinsic antiferromagnetic topological insulator MnBi$_{2}$Te$_{4}$ undergoes a metamagnetic transition in a c-axis magnetic field. It has been predicted that ferromagnetic MnBi$_{2}$Te$_{4}$ is an ideal Weyl semimetal with a single pair of Weyl nodes. Here we report measurements of quantum oscillations detected in the field-induced ferromagnetic phase of MnBi$_{2-x}$Sb$_{x}$Te$_{4}$, where Sb substitution tunes the majority carriers from electrons to holes. Single frequency Shubnikov-de Haas oscillations were observed in a wide range of Sb concentrations (0.54 $\leq$ x $\leq$ 1.21). The evolution of the oscillation frequency and the effective mass shows reasonable agreement with the Weyl semimetal band-structure of ferromagnetic MnBi$_{2}$Te$_{4}$ predicted by density functional calculations. Intriguingly, the quantum oscillation frequency shows a strong temperature dependence, indicating that the electronic structure sensitively depends on magnetism.
