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Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate
Topological quantum states of matter, characterized by geometrical features of electronic band structures, have been extensively studied. Among them, the topological electronic state with magnetic order remains elusive because of a scarce number of examples. Here we present experimental observations...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6072714/ https://www.ncbi.nlm.nih.gov/pubmed/30072735 http://dx.doi.org/10.1038/s41467-018-05530-9 |
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author | Ueda, Kentaro Kaneko, Ryoma Ishizuka, Hiroaki Fujioka, Jun Nagaosa, Naoto Tokura, Yoshinori |
author_facet | Ueda, Kentaro Kaneko, Ryoma Ishizuka, Hiroaki Fujioka, Jun Nagaosa, Naoto Tokura, Yoshinori |
author_sort | Ueda, Kentaro |
collection | PubMed |
description | Topological quantum states of matter, characterized by geometrical features of electronic band structures, have been extensively studied. Among them, the topological electronic state with magnetic order remains elusive because of a scarce number of examples. Here we present experimental observations proving that the pyrochlore iridate, when electronically tuned, can be a topological Weyl semimetal as predicted by recent theories. We observe a sizable spontaneous Hall conductivity with minimal magnetization only within a few Kelvin below the all-in all-out magnetic ordering temperature. Our theoretical calculation, which is quantitatively consistent with the observation, suggests that the presence of linearly-dispersing crossing points (Weyl points), acting as a source/sink of a quantized magnetic flux, potentially gives rise to such an enormous effect. The manifestation of the salient Hall response provides one important example of topological states, which promotes a better understanding of Weyl semimetal and indicates the new research direction for the topological-materials design. |
format | Online Article Text |
id | pubmed-6072714 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-60727142018-08-06 Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate Ueda, Kentaro Kaneko, Ryoma Ishizuka, Hiroaki Fujioka, Jun Nagaosa, Naoto Tokura, Yoshinori Nat Commun Article Topological quantum states of matter, characterized by geometrical features of electronic band structures, have been extensively studied. Among them, the topological electronic state with magnetic order remains elusive because of a scarce number of examples. Here we present experimental observations proving that the pyrochlore iridate, when electronically tuned, can be a topological Weyl semimetal as predicted by recent theories. We observe a sizable spontaneous Hall conductivity with minimal magnetization only within a few Kelvin below the all-in all-out magnetic ordering temperature. Our theoretical calculation, which is quantitatively consistent with the observation, suggests that the presence of linearly-dispersing crossing points (Weyl points), acting as a source/sink of a quantized magnetic flux, potentially gives rise to such an enormous effect. The manifestation of the salient Hall response provides one important example of topological states, which promotes a better understanding of Weyl semimetal and indicates the new research direction for the topological-materials design. Nature Publishing Group UK 2018-08-02 /pmc/articles/PMC6072714/ /pubmed/30072735 http://dx.doi.org/10.1038/s41467-018-05530-9 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Ueda, Kentaro Kaneko, Ryoma Ishizuka, Hiroaki Fujioka, Jun Nagaosa, Naoto Tokura, Yoshinori Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate |
title | Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate |
title_full | Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate |
title_fullStr | Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate |
title_full_unstemmed | Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate |
title_short | Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate |
title_sort | spontaneous hall effect in the weyl semimetal candidate of all-in all-out pyrochlore iridate |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6072714/ https://www.ncbi.nlm.nih.gov/pubmed/30072735 http://dx.doi.org/10.1038/s41467-018-05530-9 |
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