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

Eun Kyo Ko, Sungsoo Hahn, Changhee Sohn, Sangmin Lee, Seung-Sup B. Lee, Byungmin Sohn, Jeong Rae Kim, Jaeseok Son, Jeongkeun Song, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim (), Changyoung Kim () and Tae Won Noh ()
Additional contact information
Eun Kyo Ko: Institute for Basic Science (IBS)
Sungsoo Hahn: Seoul National University
Changhee Sohn: Ulsan National Institute of Science and Technology
Sangmin Lee: Seoul National University
Seung-Sup B. Lee: Seoul National University
Byungmin Sohn: Institute for Basic Science (IBS)
Jeong Rae Kim: Institute for Basic Science (IBS)
Jaeseok Son: Institute for Basic Science (IBS)
Jeongkeun Song: Institute for Basic Science (IBS)
Youngdo Kim: Institute for Basic Science (IBS)
Donghan Kim: Institute for Basic Science (IBS)
Miyoung Kim: Seoul National University
Choong H. Kim: Institute for Basic Science (IBS)
Changyoung Kim: Institute for Basic Science (IBS)
Tae Won Noh: Institute for Basic Science (IBS)

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: 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 t2g 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.

Date: 2023
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DOI: 10.1038/s41467-023-39188-9

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