论文标题
拉曼散射揭示的pyrochlore触发物中的Weyl-Luttinger相变
Weyl-Luttinger phase transition in pyrochlore iridates revealed by Raman scattering
论文作者
论文摘要
pyrochlore虹膜被认为是实现拓扑非平凡且牢固相关状态的肥沃基础。在这里，我们提供了一个令人信服的证据，即在nd $ _2 $ _2 $ _2 $ o $ _7 $和二次频段触摸pr $ _2 $ _2 $ ir $ _2 $ o $ $ _7 $中，以nd $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ o $ _7 $进行相互作用的证据。我们观察到拓扑Weyl半学和Luttinger半学之间的磁相变，并在ND $ _2 $ _2 $ _2 $ _2 $ o $ $ _7 $中触摸二次频段。我们对来自Weyl和Luttinger准颗粒的拉曼散射的理论分析与实验观测一致，并可以通过相对较短的准粒子寿命来表征材料参数的表征。
Pyrochlore iridates are thought to be a fertile ground for the realization of topologically non-trivial and strongly correlated states of matter. Here we provide a compelling evidence of interacting Weyl electrons in Nd$_2$Ir$_2$O$_7$ and quadratic band touching in Pr$_2$Ir$_2$O$_7$ by Raman scattering. We observe a magnetically-driven phase transition between the topological Weyl semimetal and a Luttinger semimetal with quadratic band touching in Nd$_2$Ir$_2$O$_7$. Our theoretical analysis of the Raman scattering from Weyl and Luttinger quasiparticles agrees with experimental observations, and enables a characterization of the material parameters while revealing interaction and disorder effects through a relatively short quasiparticle lifetime.
