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Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system

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Title
Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system
Author(s)
Eun Kyo Ko; Hahn, Sungsoo; Sohn, Changhee; Lee, Sangmin; Lee, Seung-Sup B.; Byungmin Sohn; Jeong Rae Kim; Jaeseok Son; Jeongkeun Song; Youngdo Kim; Donghan Kim; Kim, Miyoung; Choong H. Kim; Changyoung Kim; Tae Won Noh
Publication Date
2023-06
Journal
Nature Communications, v.14, no.1
Publisher
Nature Research
Abstract
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 SrRuO3 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 dxy band and a Mott gap in the dxz/yz bands. Our study provides an effective experimental method for investigation of orbital-selective phenomena in multi-orbital materials. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13574
DOI
10.1038/s41467-023-39188-9
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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