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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...

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Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
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.
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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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