Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface

Abstract

We report on an extraordinary field effect of the superconducting LaAlO3/KTaO3(111) interface with Tc ~2 K. By applying a gate voltage (VG) across KTaO3, the interface can be continuously tuned from superconducting into insulating states, yielding a dome-shaped Tc-VG dependence. The electric gating has only a minor effect on carrier density as evidenced in the Hall-effect measurement, while it changes spatial profile of the carriers in the interface, hence the carrier's disorder level significantly. As temperature is decreased, the resistance saturates at lowest temperature in both superconducting and insulating sides, despite an initial dramatic dropping or increasing, which suggests an emergence of quantum metallic state associated with failed superconductor and/or fragile insulator. A VG-modulation of the magnetic-field-driven superconductor to insulator quantum phase transition reveals a non-universal criticality.

11 pages, 4 figures

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Cited by in corpus (46)

• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Spin-charge interconversion in KTaO${}_3$ two-dimensional electron gases
• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Superfluid stiffness of a KTaO3-based two-dimensional electron gas
• Electrically controlled superconductor-insulator transition and giant anomalous Hall effect in kagome metal CsV3Sb5 nanoflakes
• Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress
• Superconductivity in monolayer Ba${}_2$N electride: a first-principles study
• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Enhanced Critical Field of Superconductivity at an Oxide Interface
• Orientation-dependent electron-phonon coupling in interfacial superconductors LaAlO3/KTaO3
• Theory of superconductivity in doped quantum paraelectrics
• Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate
• Gate-tunability of the superconducting state at the $EuO/KTa{O}_3(111)$ interface
• Nanoscale control of the metal-insulator transition at LAO/KTO (110) and LAO/KTO (111) interfaces
• Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces
• Large nonlinear Hall effect and Berry curvature in KTaO3 based two-dimensional electron gas
• Tunable Ferromagnetism in LaCoO3 Epitaxial Thin Films
• High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
• Quasi two-dimensional nature of high-Tc superconductivity in iron-based (Li,Fe)OHFeSe
• Ionic modulation at the LaAlO${}_3$/KTaO${}_3$ interface for extreme high-mobility two-dimensional electron gas
• Superconductivity at epitaxial LaTiO3-KTaO3 interfaces
• Emergence of high-temperature superconductivity at the interface of two Mott insulators
• Two-Dimensional Superconductivity at the Titanium Sesquioxide Heterointerface
• Flux-flow instability across Berezinskii Kosterlitz Thouless phase transition in KTaO${}_3$ (111) based superconductor
• Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
• Anisotropic Rashba coupling to polar modes in KTaO3
• Superconducting quantum oscillations and anomalous negative magnetoresistance in a honeycomb nanopatterned oxide interface superconductor
• Interplay between the extended s-wave symmetry of the gap and the spin-orbit coupling in the low-electron concentration regime of quasi-two-dimensional superconductors
• Direct observation of two-dimensional small polarons at correlated oxide interface
• Mechanism for Switchability in Electron-Doped Ferroelectric Interfaces
• Surface charge writing and non-volatile control of superconductivity in LaAlO3/KTaO3(111) heterostructure
• The Origin of Two-dimensional Electron Gas in Zn${}_{1-x}$Mg${}_x$O/ZnO Heterostructures
• Universally enhanced superconductivity and coexisting ferroelectricity at oxide interfaces
• Two-Dimensional Charge Localization at the Perovskite Oxide Interface
• Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor
• Anisotropic vortex motion and two-dimensional superconducting transition
• Electric Field Induced Superconductivity in Bilayer Octagraphene
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$
• Orbital homology of p and t2g orbitals in models and materials
• Percolative Pathway to Stripe Order in KTaO3-Based Superconductivity
• Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces
• Geometric Control of Pairing: Universal Scaling of Superconductivity at KTaO3 Interfaces
• What controls the superconducting dome of electron-doped FeSe?
• Observation of Quantum-Criticality-Class Crossover at the LaAlO${}_3$/KTaO${}_3$ (111) Interface
• Spontaneous nonreciprocal transport in a gate-tunable ferromagnetic Rashba 2-dimensional electron gas
• Atomistic modeling of molecular beam epitaxy growth of SrTiO3 and Sr2TiO4 thin films