Weyl-Luttinger phase transition in pyrochlore iridates revealed by Raman scattering
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866910748109701120 |
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| author | Nikolić, Predrag Xu, Yuanyuan Ohtsuki, Takumi Nakatsuji, Satoru Drichko, Natalia |
| author_facet | Nikolić, Predrag Xu, Yuanyuan Ohtsuki, Takumi Nakatsuji, Satoru Drichko, Natalia |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2204_13722 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Weyl-Luttinger phase transition in pyrochlore iridates revealed by Raman scattering Nikolić, Predrag Xu, Yuanyuan Ohtsuki, Takumi Nakatsuji, Satoru Drichko, Natalia Materials Science 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. |
| title | Weyl-Luttinger phase transition in pyrochlore iridates revealed by Raman scattering |
| topic | Materials Science |
| url | https://arxiv.org/abs/2204.13722 |