The density and disorder tuned superconductor-metal transition in two dimensions

Abstract

Quantum ground states which arise at atomically controlled oxide interfaces provide an opportunity to address key questions in condensed matter physics, including the nature of two-dimensional (2D) metallic behaviour often observed adjacent to superconductivity. At the superconducting LaAlO3/SrTiO3 interface, a metallic ground state emerges upon the collapse of superconductivity with field-effect gating. Strikingly, such metallicity is accompanied with a pseudogap. Here, we utilize independent control of carrier density and disorder of the interfacial superconductor using dual electrostatic gates, which enables the comprehensive examination of the electronic phase diagram approaching zero temperature. We find that the pseudogap corresponds to precursor pairing, and the onset of long-range phase coherence forms a 2D superconducting dome as a function of the dual gate voltages. The gate-tuned superconductor-metal transitions are driven by macroscopic phase fluctuations of Josephson coupled superconducting puddles.

References in corpus (21)

• Why Some Interfaces Cannot be Sharp
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Possible Metal/Insulator Transition at B=0 in Two Dimensions
• Electrically Tunable Low Density Superconductivity in a Monolayer Topological Insulator
• Gate-induced superconductivity in a monolayer topological insulator
• Nature of the superconductor-insulator transition in disordered superconductors
• Dominant mobility modulation by the electric field effect at the LaAlO_3 / SrTiO_3 interface
• Metal-Insulator Transition in Disordered Two-Dimensional Electron Systems
• Anomalous metals -- failed superconductors
• Single and two-particle energy gaps across the disorder-driven superconductor-insulator transition
• Transport in strongly correlated two dimensional electron fluids
• The Elusive Bose Metal
• Approaching Zero-Temperature Metallic States in Mesoscopic Superconductor-Normal-Superconductor Arrays
• Theory of quantum metal to superconductor transitions in highly conducting systems
• Superconducting, Insulating, and Anomalous Metallic Regimes in a Gated Two-Dimensional Semiconductor-Superconductor Array
• Dual-Gate Modulation of Carrier Density and Disorder in an Oxide Two-Dimensional Electron System
• Interactions and Scaling in a Disordered Two-Dimensional Metal
• Observation of the ghost critical field for superconducting fluctuations in a disordered TaN thin film
• Anomalous conductivity, Hall factor, magnetoresistance, and thermopower of accumulation layer in ${\text{SrTiO}}_3$

Cited by in corpus (35)

• Electrically Tunable Low Density Superconductivity in a Monolayer Topological Insulator
• Discovery of two-dimensional anisotropic superconductivity at KTaO${}_3$ (111) interfaces
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
• Ambient-pressure superconductivity onset above 40 K in bilayer nickelate ultrathin films
• Doping-driven topological polaritons in graphene/α-MoO3 heterostructures
• Quantum coherence across bosonic superconductor-anomalous metal-insulator transitions
• Observation of two-dimensional superconductivity at the LaAlO3/KTaO3(110) heterointerface
• When Superconductivity Crosses Over: From BCS to BEC
• Coexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe${}_2$ superconductor
• Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors
• Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress
• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Anomalous quantum metal in a 2D crystalline superconductor with intrinsic electronic non-uniformity
• Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
• Vortex phase diagram and the normal state of cuprates with charge and spin orders
• Anomalous metals: from "failed superconductor" to "failed insulator"
• Signatures of a pair density wave at high magnetic fields in cuprates with charge and spin orders
• Universal behavior of the bosonic metallic ground state in a two-dimensional superconductor
• Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces
• High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
• Robust anomalous metallic states and vestiges of self duality in two-dimensional granular In-InOx composites
• Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Two-Dimensional Superconductivity at the Titanium Sesquioxide Heterointerface
• Flux-flow instability across Berezinskii Kosterlitz Thouless phase transition in KTaO${}_3$ (111) based superconductor
• Superconducting fluctuations and charge-4$e$ plaquette state at strong coupling
• Density-tuned isotherms and dynamic change at phase transition in a gate-controlled superconducting system
• Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor
• In-situ scattering studies of superconducting vacancy-ordered monoclinic TiO thin films
• Superconductivity from the Slater mode: Application to KTaO3 heterostructures
• Superconducting weak links at substrate steps in bilayer nickelate films
• In-plane quasi-single-domain BaTiO${}_3$ via interfacial symmetry engineering
• Zero temperature superconductor - edge metal - insulator transition in $2D$ bosonic systems
• Origin of the dome-shaped superconducting phase diagram in ${\mathrm{SrTiO}}_3$-based interfaces