论文标题
Fermi表面拓扑结构和非平凡的浆果阶段在平面半观PD $ _3 $ pb中
Fermi surface topology and non-trivial Berry phase in the flat-band semimetal Pd$_3$Pb
论文作者
论文摘要
对假定拓扑半学PD $ _3 $ pb的费米表面的研究已使用Shubnikov-de Haas（SDH）振荡进行，在多达60吨的领域中测量的pd $ _3 $ pb在社区中引起了人们的注意，这是由于Fermi Surface at the and pickite and pickite and pixpect and the ore theoreTe and the ore theereTe，该振荡在社区中引起了人们的注意。 Rev. B 98，035130（2018）]沿着$ X-γ$以及多个三重脱位带交叉携带，在旋转轨道耦合的影响下，导致了十个四倍的退化点。对SDH振荡数据的分析验证了计算出的多页面费米表面，揭示了$γ$中心的球体，该球体在先前的研究中尚未实验解决。对SDH振荡相的综合，依赖角度依赖性分析令人信服地证明了沿$γ-R $的两个频段的非平凡浆果相，支持理论预测，同时证明了极端轨道之间的极端轨道之间的干扰，这些干扰模拟了中间角度的微不足道的浆果相。
A study of the Fermi surface of the putative topological semimetal Pd$_3$Pb has been carried out using Shubnikov-de Haas (SdH) oscillations measured in fields of up to 60 T. Pd$_3$Pb has garnered attention in the community due to a peculiar Fermi surface that has been proposed theoretically by Ahn, Pickett, and Lee, [Phys. Rev. B 98, 035130 (2018)] to host a dispersion-less band along $X-Γ$ as well as multiple triply-degenerate band crossings that, under the influence of spin-orbit coupling, lead to ten four-fold degenerate Dirac points. Analysis of the SdH oscillation data verifies the calculated multi-sheet Fermi surface, revealing a $Γ$ centered spheroid that had not been resolved experimentally in prior studies. A comprehensive, angle-dependent analysis of the phase of the SdH oscillations convincingly demonstrates a non-trivial Berry phase for two bands along $Γ-R$, supporting the theoretical predictions, while simultaneously evidencing interference between extremal orbits that mimics a trivial Berry phase at intermediate angles.
