Observation of metallic electronic structure in a single-atomic-layer oxide

Byungmin Sohn, Jeong Rae Kim, Choong H. Kim, Sangmin Lee, Sungsoo Hahn, Younsik Kim, Soonsang Huh, Donghan Kim, Youngdo Kim, Wonshik Kyung, Minsoo Kim, Miyoung Kim, Tae Won Noh () and Changyoung Kim ()
Additional contact information
Byungmin Sohn: Institute for Basic Science
Jeong Rae Kim: Institute for Basic Science
Choong H. Kim: Institute for Basic Science
Sangmin Lee: Seoul National University
Sungsoo Hahn: Institute for Basic Science
Younsik Kim: Institute for Basic Science
Soonsang Huh: Institute for Basic Science
Donghan Kim: Institute for Basic Science
Youngdo Kim: Institute for Basic Science
Wonshik Kyung: Institute for Basic Science
Minsoo Kim: Institute for Basic Science
Miyoung Kim: Seoul National University
Tae Won Noh: Institute for Basic Science
Changyoung Kim: Institute for Basic Science

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Correlated electrons in transition metal oxides exhibit a variety of emergent phases. When transition metal oxides are confined to a single-atomic-layer thickness, experiments so far have shown that they usually lose diverse properties and become insulators. In an attempt to extend the range of electronic phases of the single-atomic-layer oxide, we search for a metallic phase in a monolayer-thick epitaxial SrRuO3 film. Combining atomic-scale epitaxy and angle-resolved photoemission measurements, we show that the monolayer SrRuO3 is a strongly correlated metal. Systematic investigation reveals that the interplay between dimensionality and electronic correlation makes the monolayer SrRuO3 an incoherent metal with orbital-selective correlation. Furthermore, the unique electronic phase of the monolayer SrRuO3 is found to be highly tunable, as charge modulation demonstrates an incoherent-to-coherent crossover of the two-dimensional metal. Our work emphasizes the potentially rich phases of single-atomic-layer oxides and provides a guide to the manipulation of their two-dimensional correlated electron systems.

Date: 2021
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DOI: 10.1038/s41467-021-26444-z

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