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Correlated electrons in transition metal oxides (TMOs) exhibit a variety ofemergent phases. When TMOs are confined to a single-atomic-layer thickness,experiments so far have shown that they usually lose diverse properties andbecome insulators. In an attempt to extend the range of electronic phases ofthe single-atomic-layer oxide, we search for a metallic phase in amonolayer-thick epitaxial SrRuO$_3$ film. Combining atomic-scale epitaxy andangle-resolved photoemission measurements, we show that the monolayer SrRuO$_3$is a strongly correlated metal. Systematic investigation reveals that theinterplay between dimensionality and electronic correlation makes the monolayerSrRuO$_3$ an incoherent metal with orbital-selective correlation. Furthermore,the unique electronic phase of the monolayer SrRuO$_3$ is found to be highlytunable, as charge modulation demonstrates an incoherent-to-coherent crossoverof the two-dimensional metal. Our work emphasizes the potentially rich phasesof single-atomic-layer oxides and provides a guide to the manipulation of theirtwo-dimensional correlated electron systems.

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