Weyl-Luttinger phase transition in pyrochlore iridates revealed by Raman scattering

Abstract

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.

arXiv comment8 pages, 3 figures; improved fitting of theory to experiment

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