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Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system
Hund’s rule coupling (J) has attracted much attention recently for its role in the description of the novel quantum phases of multi-orbital materials. Depending on the orbital occupancy, J can lead to various intriguing phases. However, experimental confirmation of the orbital occupancy dependency h...
Autores principales: | , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10275918/ https://www.ncbi.nlm.nih.gov/pubmed/37328474 http://dx.doi.org/10.1038/s41467-023-39188-9 |
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author | Ko, Eun Kyo Hahn, Sungsoo Sohn, Changhee Lee, Sangmin Lee, Seung-Sup B. Sohn, Byungmin Kim, Jeong Rae Son, Jaeseok Song, Jeongkeun Kim, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim, Changyoung Noh, Tae Won |
author_facet | Ko, Eun Kyo Hahn, Sungsoo Sohn, Changhee Lee, Sangmin Lee, Seung-Sup B. Sohn, Byungmin Kim, Jeong Rae Son, Jaeseok Song, Jeongkeun Kim, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim, Changyoung Noh, Tae Won |
author_sort | Ko, Eun Kyo |
collection | PubMed |
description | Hund’s rule coupling (J) has attracted much attention recently for its role in the description of the novel quantum phases of multi-orbital materials. Depending on the orbital occupancy, J can lead to various intriguing phases. However, experimental confirmation of the orbital occupancy dependency has been difficult as controlling the orbital degrees of freedom normally accompanies chemical inhomogeneities. Here, we demonstrate a method to investigate the role of orbital occupancy in J related phenomena without inducing inhomogeneities. By growing SrRuO(3) monolayers on various substrates with symmetry-preserving interlayers, we gradually tune the crystal field splitting and thus the orbital degeneracy of the Ru t(2g) orbitals. It effectively varies the orbital occupancies of two-dimensional (2D) ruthenates. Via in-situ angle-resolved photoemission spectroscopy, we observe a progressive metal-insulator transition (MIT). It is found that the MIT occurs with orbital differentiation: concurrent opening of a band insulating gap in the d(xy) band and a Mott gap in the d(xz/yz) bands. Our study provides an effective experimental method for investigation of orbital-selective phenomena in multi-orbital materials. |
format | Online Article Text |
id | pubmed-10275918 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-102759182023-06-18 Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system Ko, Eun Kyo Hahn, Sungsoo Sohn, Changhee Lee, Sangmin Lee, Seung-Sup B. Sohn, Byungmin Kim, Jeong Rae Son, Jaeseok Song, Jeongkeun Kim, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim, Changyoung Noh, Tae Won Nat Commun Article Hund’s rule coupling (J) has attracted much attention recently for its role in the description of the novel quantum phases of multi-orbital materials. Depending on the orbital occupancy, J can lead to various intriguing phases. However, experimental confirmation of the orbital occupancy dependency has been difficult as controlling the orbital degrees of freedom normally accompanies chemical inhomogeneities. Here, we demonstrate a method to investigate the role of orbital occupancy in J related phenomena without inducing inhomogeneities. By growing SrRuO(3) monolayers on various substrates with symmetry-preserving interlayers, we gradually tune the crystal field splitting and thus the orbital degeneracy of the Ru t(2g) orbitals. It effectively varies the orbital occupancies of two-dimensional (2D) ruthenates. Via in-situ angle-resolved photoemission spectroscopy, we observe a progressive metal-insulator transition (MIT). It is found that the MIT occurs with orbital differentiation: concurrent opening of a band insulating gap in the d(xy) band and a Mott gap in the d(xz/yz) bands. Our study provides an effective experimental method for investigation of orbital-selective phenomena in multi-orbital materials. Nature Publishing Group UK 2023-06-16 /pmc/articles/PMC10275918/ /pubmed/37328474 http://dx.doi.org/10.1038/s41467-023-39188-9 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Ko, Eun Kyo Hahn, Sungsoo Sohn, Changhee Lee, Sangmin Lee, Seung-Sup B. Sohn, Byungmin Kim, Jeong Rae Son, Jaeseok Song, Jeongkeun Kim, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim, Changyoung Noh, Tae Won Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system |
title | Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system |
title_full | Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system |
title_fullStr | Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system |
title_full_unstemmed | Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system |
title_short | Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system |
title_sort | tuning orbital-selective phase transitions in a two-dimensional hund’s correlated system |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10275918/ https://www.ncbi.nlm.nih.gov/pubmed/37328474 http://dx.doi.org/10.1038/s41467-023-39188-9 |
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