Observation of metallic electronic structure in a single-atomic-layer oxide
arXiv:2109.11090 · doi:10.1038/s41467-021-26444-z
Abstract
Correlated electrons in transition metal oxides (TMOs) exhibit a variety of emergent phases. When TMOs 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 SrRuO film. Combining atomic-scale epitaxy and angle-resolved photoemission measurements, we show that the monolayer SrRuO is a strongly correlated metal. Systematic investigation reveals that the interplay between dimensionality and electronic correlation makes the monolayer SrRuO an incoherent metal with orbital-selective correlation. Furthermore, the unique electronic phase of the monolayer SrRuO 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.
References in corpus (26)
- Electric Field Effect in Atomically Thin Carbon Films
- Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
- Van der Waals heterostructures
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Boron nitride substrates for high-quality graphene electronics
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Correlated Electrons in High Temperature Superconductors
- Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
- Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
- Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers
- Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films
- PyProcar: A Python library for electronic structure pre/post-processing
- Metal-insulator transition in ultrathin LaNiO3 films
- Fermi Arcs in a Doped Pseudospin-1/2 Heisenberg Antiferromagnet
- Fundamental thickness limit of itinerant ferromagnetic SrRuO thin films
- Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in SrRuO under uniaxial stress
- Prominent quasi-particle peak in the photoemission spectrum of the metallic phase of V_2O_3
- Quasiparticle Mass Enhancement and Temperature Dependence of the Electronic Structure of Ferromagnetic SrRuO3 Thin Films
- Electronic structure of CaSrVO: a tale of two energy-scales
- Dimensionality-driven metal-insulator-transition in spin-orbit coupled SrIrO
- Observation of a novel orbital selective Mott transition in CaSrRuO
- Pseudogap of metallic layered nickelate R2-xSrxNiO4 (R=Nd, Eu) crystals measured using angle-resolved photoemission spectroscopy
- Sign-tunable anomalous Hall effect induced by two-dimensional symmetry-protected nodal structures in ferromagnetic perovskite oxide thin films
- Phase Instability amid Dimensional Crossover in Artificial Oxide Crystal
- Interplay between spin-orbit coupling and van Hove singularity in the Hund's metallicity of SrRuO
- SrRuO-SrTiO heterostructure as a possible platform for studying unconventional superconductivity in SrRuO