Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid

Abstract

The recent observation of superconductivity at the interfaces between KTaO3 and EuO (or LaAlO3) offers a new example of emergent phenomena at oxide interfaces. This superconductivity exhibits an unusual strong dependence on the crystalline orientation of KTaO3 and its superconducting transition temperature Tc is nearly one order of magnitude higher than that of the seminal LaAlO3/SrTiO3 interface. To understand its mechanism, it is crucial to address if the formation of oxide interfaces is indispensable for the presence of superconductivity. Here, by exploiting ionic liquid (IL) gating, we obtain superconductivity at KTaO3 (111) and (110) surfaces with Tc up to 2.0 K and 1.0 K, respectively. This oxide-interface-free superconductivity gives a clear experimental evidence that the essential physics of KTaO3 interface superconductivity lies in the KTaO3 surfaces doped with electrons. Moreover, the ability to control superconductivity at surfaces with IL provides a simple way to study the intrinsic superconductivity in KTaO3.

14 pages in total. 4 figures in the maix text. 6 figures in the Suppemental Materials

References in corpus (12)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Highly crystalline 2D superconductors
• High-temperature interface superconductivity between metallic and insulating cuprates
• Discovery of two-dimensional anisotropic superconductivity at KTaO${}_3$ (111) interfaces
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials
• Topological superconductivity and unconventional pairing in oxide interfaces
• Magnetically Induced Metallic Phase in Superconducting Tantalum Films
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO${}_3$/SrTiO${}_3$ Interface
• Superconductor-insulator quantum phase transition
• Magnetoresistance in the superconducting state at the (111) LaAlO${}_3$/SrTiO${}_3$ interface

Cited by in corpus (93)

• 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
• 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
• Oxygen vacancy induced electronic structure modification of KTaO${}_3$
• Ferroelectric, quantum paraelectric or paraelectric? Calculating the evolution from BaTiO${}_3$ to SrTiO${}_3$ to KTaO${}_3$ using a single-particle quantum-mechanical description of the ions
• Superconductivity from energy fluctuations in dilute quantum critical polar metals
• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Ultra-High Carrier Mobilities in Ferroelectric Domain Wall Corbino Cones at Room Temperature
• Molecular Beam Epitaxy of KTaO${}_3$
• Enhanced Critical Field of Superconductivity at an Oxide Interface
• Orientation-dependent electron-phonon coupling in interfacial superconductors LaAlO3/KTaO3
• Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics
• Superconductivity enhancement in polar metal regions of Sr${}_{0.95}$Ba${}_{0.05}$TiO${}_3$ and Sr${}_{0.985}$Ca${}_{0.015}$TiO${}_3$ revealed by the systematic Nb doping
• Theory of superconductivity in doped quantum paraelectrics
• Orbital design of Berry curvature: pinch points and giant dipoles induced by crystal fields
• Advances in Complex Oxide Quantum Materials Through New Approaches to Molecular Beam Epitaxy
• Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate
• Coexistence of ferromagnetism and superconductivity at KTaO${}_3$ heterointerfaces
• Nanoscale control of the metal-insulator transition at LAO/KTO (110) and LAO/KTO (111) interfaces
• Gate-tunability of the superconducting state at the $EuO/KTa{O}_3(111)$ interface
• Large nonlinear Hall effect and Berry curvature in KTaO3 based two-dimensional electron gas
• Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces
• Electronic subbands in the a-LaAlO${}_3$/KTaO${}_3$ interface revealed by quantum oscillations in high magnetic fields
• Anisotropic Electronic Structure of the Two-Dimensional Electron Gas at the AlOx/KTaO3(110) interface
• Tunable Ferromagnetism in LaCoO3 Epitaxial Thin Films
• Two-Dimensional Electron Gas with High Mobility Forming at BaO/SrTiO3 Interface
• A theory of criticality for quantum ferroelectric metals
• Ionic modulation at the LaAlO${}_3$/KTaO${}_3$ interface for extreme high-mobility two-dimensional electron gas
• Observation of surface superconductivity in a three-dimensional Dirac material
• 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
• High orbital-moment Cooper pairs by crystalline symmetry breaking
• Quantum fluctuations lead to glassy electron dynamics in the good metal regime of electron doped KTaO3
• Interaction-driven first-order and higher-order topological superconductivity
• Spin-to-charge conversion at KTaO3(111) interfaces
• In-situ tunable giant electrical anisotropy in a grating gated AlGaN/GaN two-dimensional electron gas
• Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
• Anisotropic Rashba coupling to polar modes in KTaO3
• Revealing subterahertz atomic vibrations in quantum paraelectrics by surface-sensitive spintronic terahertz spectroscopy
• 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
• Rashba spin-orbit coupling in infinite-layer nickelate films on SrTiO3(001) and KTaO3(001)
• Coupling of electronic and structural degrees of freedom in vanadate superlattices
• Dense and single-phase KTaO${}_3$ ceramics obtained by spark plasma sintering
• Robust cross-chain surface interstitial electronic states and doping-enhanced superconductivity in monolayer $M_2$N ($M$= Ti, Zr, Hf) electrides
• Perspective: Molecular beam epitaxy of antiperovskite oxides
• Hard x-ray angle-resolved photoemission from a buried high-mobility electron system
• Majorana modes in striped two-dimensional inhomogeneous topological superconductors
• Divergent electrostriction at ferroelectric phase transitions: example of strain-induced ferroelectiricty in KTaO3
• BinPo: An open-source code to compute the band structure of two-dimensional electron systems
• Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
• Direct observation of two-dimensional small polarons at correlated oxide interface
• Signatures of enhanced spin-triplet superconductivity induced by interfacial properties
• Surface charge writing and non-volatile control of superconductivity in LaAlO3/KTaO3(111) heterostructure
• Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca${}_2$RuO${}_4$
• Mechanism for Switchability in Electron-Doped Ferroelectric Interfaces
• Quantum Griffiths singularity in a three-dimensional superconductor to Anderson critical insulator transition
• Robust topological superconductivity in spin-orbit coupled systems at higher-order van Hove filling
• Dirac-like fermions anomalous magneto-transport in a spin-polarized oxide two-dimensional electron system
• Violation of Pauli Limit at KTaO3(110) Interfaces
• Universally enhanced superconductivity and coexisting ferroelectricity at oxide interfaces
• Two-Dimensional Charge Localization at the Perovskite Oxide Interface
• Strain Effects in SrHfO${}_3$ Films Grown by Hybrid Molecular Beam Epitaxy
• Electronic spin susceptibility in metallic strontium titanate
• Competing electronic states emerging on polar surfaces
• Ferromagnetic Two-dimensional Electron Gases with Magnetic Doping and Proximity Effects
• Anisotropic vortex motion and two-dimensional superconducting transition
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$
• Exciton-Enhanced Superconductivity in Monolayer Films of Aluminum
• Interfacial superconductivity in the type-III heterostructure SnSe${}_2$/PtTe${}_2$
• Superconductivity from the Slater mode: Application to KTaO3 heterostructures
• Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor
• Orbital and Spin Edelstein Effects in KTaO${}_3$(110) Two-Dimensional Electron Gases
• KTaO3(001) Preparation Methods in Vacuum: Effects on Surface Stoichiometry, Crystallography, and in-gap States
• Superconductivity in spin-orbit coupled BaBi${}_3$ formed by in situ reduction of bismuthate films
• Hysteretic Magnetoresistance in a Non-Magnetic SrSnO3 Film via Thermal Coupling to Dynamic Substrate Behavior
• Gap Anisotropy in Layered Superconductors Due to Rashba and Dresselhaus Spin-Orbit Interactions
• Absence of localized $5d^1$ electrons in KTaO${}_3$ interface superconductors
• Observation of Quantum-Criticality-Class Crossover at the LaAlO${}_3$/KTaO${}_3$ (111) Interface
• Percolative Pathway to Stripe Order in KTaO3-Based Superconductivity
• Geometric Control of Pairing: Universal Scaling of Superconductivity at KTaO3 Interfaces
• Controlling Spin-Mixing Conductance in KTaO${}_3$ 2DEGs by Varying Argon-Ion Irradiation Time
• Atomistic modeling of molecular beam epitaxy growth of SrTiO3 and Sr2TiO4 thin films
• Realization of Air-Stable Two-Dimensional Superconductor Nb2Pd3Te5 With Quasi-One-Dimensional Pair Density Modulation
• A strong polarizing field in thin-film paraelectrics
• An emergent quasi-2D metallic state derived from the Mott insulator framework
• Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces