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

Autor:	Nikolić, Predrag, Xu, Yuanyuan, Ohtsuki, Takumi, Nakatsuji, Satoru, Drichko, Natalia
Rok vydání:	2022
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	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. Comment: 8 pages, 3 figures; improved fitting of theory to experiment
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2204.13722 Zobrazit plný text záznamu View this record from Arxiv