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Heteroepitaxial Control of Fermi Liquid, Hund Metal, and Mott Insulator Phases in Single-Atomic-Layer Ruthenates

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Title
Heteroepitaxial Control of Fermi Liquid, Hund Metal, and Mott Insulator Phases in Single-Atomic-Layer Ruthenates
Author(s)
Jeong Rae Kim; Byungmin Sohn; Hyeong Jun Lee; Lee, Sangmin; Eun Kyo Ko; Sungsoo Hahn; Sangjae Lee; Younsik Kim; Donghan Kim; Hong Joon Kim; Youngdo Kim; Jaeseok Son; Ahn, Charles H. H.; Walker, Frederick J. J.; Go, Ara; Kim, Miyoung; Choong H. H. Kim; Changyoung Kim; Tae Won Noh
Publication Date
2023-04
Journal
ADVANCED MATERIALS, v.35, no.15
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Interfaces between dissimilar correlated oxides can offer devices with versatile functionalities, and great efforts have been made to manipulate interfacial electronic phases. However, realizing such phases is often hampered by the inability to directly access the electronic structure information; most correlated interfacial phenomena appear within a few atomic layers from the interface. Here, atomic-scale epitaxy and photoemission spectroscopy are utilized to realize the interface control of correlated electronic phases in atomic-scale ruthenate-titanate heterostructures. While bulk SrRuO3 is a ferromagnetic metal, the heterointerfaces exclusively generate three distinct correlated phases in the single-atomic-layer limit. The theoretical analysis reveals that atomic-scale structural proximity effects yield Fermi liquid, Hund metal, and Mott insulator phases in the quantum-confined SrRuO3. These results highlight the extensive interfacial tunability of electronic phases, hitherto hidden in the atomically thin correlated heterostructure. Moreover, this experimental platform suggests a way to control interfacial electronic phases of various correlated materials.
URI
https://pr.ibs.re.kr/handle/8788114/13298
DOI
10.1002/adma.202208833
ISSN
0935-9648
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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