论文标题
部分可观测时空混沌系统的无模型预测
de Haas-van Alphen effect and the first-principles study of the possible topological stannide Cu$_3$Sn
论文作者
论文摘要
对具有不同对称性保护拓扑状态的量子材料的追求一直是最近研究兴趣的重点，这主要是由于它们引人入胜的物理特性和潜在的技术实用性。在这项工作中，我们报告了Magnetotransport，De Haas-Van Alphen（DHVA）振荡以及Stannide Cu $ _3 $ _3 $ sn的第一原理计算，该计算是等于最近报道的拓扑半学半学的AG $ _3 $ sn。发现磁磁性在田间有变化。在2 K时低至1泰斯拉的场下观察到明显的DHVA振荡，三个主要振荡频率$f_α$ = 8.74 t，$f_β$ = 150.19 t和$f_γ$ = 229.66吨，有效的质量极小。 DHVA量子振荡的分析表明，可能的非零浆液相，暗示了非平凡的带拓扑。非平凡电子拓扑的佐证证据也来自第一原理计算，该计算产生了非零$ \ mathbb {z} _2 $拓扑指数。这些结果共同表明，与其同源性Ag $ _3 $ sn相比，Cu $ _3 $ sn可能是另一个托管拓扑迪拉克费米子的金属间stannide。
The quest for quantum materials with diverse symmetry-protected topological states has been the focus of recent research interest, primarily due to their fascinating physical properties and the potential technological utility. In this work, we report on the magnetotransport, de Haas-van Alphen (dHvA) oscillations, and the first-principles calculations of the stannide Cu$_3$Sn that is isostructural with the recently reported topological semimetal Ag$_3$Sn. The magnetoresistance was found to vary quasi-linearly in field. Clear dHvA oscillations were observed under a field as low as 1 Tesla at 2 K, with three major oscillation frequencies $F_α$=8.74 T, $F_β$=150.19 T and $F_γ$=229.66 T and extremely small effective masses. The analysis of dHvA quantum oscillations revealed a possible nonzero Berry phase, suggestive of the nontrivial band topology. The corroborating evidence for the nontrivial electronic topology also comes from the first-principles calculations which yield a nonzero $\mathbb{Z}_2$ topological index. These results collectively suggest that Cu$_3$Sn, in analogy to its homologue Ag$_3$Sn, may be another intermetallic stannide hosting topological Dirac fermions.
