论文标题
dirac半含量eummsb $ _2 $中的异国量子振荡所证明的频带拓扑的磁性调谐
Magnetic tuning of band topology evidenced by exotic quantum oscillations in the Dirac semimetal EuMnSb$_2$
论文作者
论文摘要
磁性和电子带拓扑之间的相互作用是拓扑问题研究中的中心兴趣。我们使用量子振荡作为功能强大的工具，以探测狄拉克半学Eumnsb $ _2 $中频段拓扑的演变。欧盟局部4F磁矩在25 K以下显示出不同的抗铁磁态，而在16 T上方的场偏置相位。在将65 K冷却至场极化状态后，振荡峰的异国温度依赖性依赖性转移伴随着非零相位的振动峰，并伴随着非零相的发展，并且是振荡振荡的巨大振动启动。带结构的计算证实了由铁磁欧盟态引起的从微不足道到非平凡的带拓扑的变化，将Eumnsb $ _2 $分类为独特的磁性拓扑半学。
Interplay between magnetism and electronic band topology is of central current interest in topological matter research. We use quantum oscillations as powerful tool to probe the evolution of band topology in the Dirac semimetal EuMnSb$_2$. The Eu local 4f magnetic moments display different antiferromagnetic states below 25 K and a field-polarized phase above 16 T. Upon cooling from 65 K into the field-polarized state, an exotic temperature dependent shift of oscillation peaks arises, accompanied by the development of non-zero Berry phase and a huge unconventional splitting of the oscillations. Band-structure calculations confirm the change from trivial to non-trivial band topology induced by the ferromagnetic Eu state, classifying EuMnSb$_2$ as unique magnetic topological semimetal.
