Nanoscale Electrostatic Control of Oxide Interfaces

Abstract

We develop a robust and versatile platform to define nanostructures at oxide interfaces via patterned top gates. Using LaAlO${}_3$/SrTiO${}_3$ as a model system, we demonstrate controllable electrostatic confinement of electrons to nanoscale regions in the conducting interface. The excellent gate response, ultra-low leakage currents, and long term stability of these gates allow us to perform a variety of studies in different device geometries from room temperature down to 50 mK. Using a split-gate device we demonstrate the formation of a narrow conducting channel whose width can be controllably reduced via the application of appropriate gate voltages. We also show that a single narrow gate can be used to induce locally a superconducting to insulating transition. Furthermore, in the superconducting regime we see indications of a gate-voltage controlled Josephson effect.

Version after peer review; includes additional data on superconductivity

References in corpus (17)

• Complexity in Strongly Correlated Electronic Systems
• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Quantum Transport in Semiconductor Nanostructures
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study
• A high-mobility two-dimensional electron gas at the heteroepitaxial spinel/perovskite complex oxide interface of γ-Al2O3/SrTiO3
• Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces
• Locally enhanced conductivity due to the tetragonal domain structure in LaAlO${}_3$/SrTiO${}_3$ heterointerfaces
• Local Electrostatic Imaging of Striped Domain Order in LaAlO3/SrTiO3
• Field-Effect Devices Utilizing LaAlO${}_3$-SrTiO${}_3$ Interfaces
• Defect engineering in oxide heterostructures by enhanced oxygen surface exchange
• Transistor operation and mobility enhancement in top-gated LaAlO_3 / SrTiO_3 heterostructures
• In-plane electronic confinement in superconducting LaAlO${}_3$/SrTiO${}_3$ nanostructures
• Magnetic and Superconducting Ordering at LaAlO3/SrTiO3 Interfaces
• Modulation of conductance and superconductivity by top-gating in LaAlO3/SrTiO3 2-dimensional electron systems

Cited by in corpus (19)

• Photoferroelectric oxides
• Universal Fabrication of Two-Dimensional Electron Systems in Functional Oxides
• Imaging and tuning polarity at SrTiO3 domain walls
• Quantum-Matter Heterostructures
• Gate-tunable band structure of the LaAlO${}_3$-SrTiO${}_3$ interface
• Side gate tunable Josephson junctions at the LaAlO${}_3$/SrTiO${}_3$ interface
• Quantum interference in an interfacial superconductor
• Field Effect Transistors with Sub-Micrometer Gate Lengths Fabricated from LaAlO${}_3$-SrTiO${}_3$-Based Heterostructures
• Superconducting quantum point contact with split gates in the two dimensional LaAlO3/SrTiO3 superfluid
• Magneto-transport study of top- and back-gated LaAlO${}_3$/SrTiO${}_3$ heterostructures
• SrTiO${}_3$ termination control: A method to tailor the oxygen exchange kinetics
• Artificial Atoms Based on Correlated Materials
• Non-universal current flow near the metal-insulator transition in an oxide interface
• Gate-tunable superconductivity at SrTiO3 surface realized by Al layer evaporation
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Dynamic Modulation of the Transport Properties of the LaAlO3/SrTiO3 Interface Using Uniaxial Strain
• Band offsets at amorphous-crystalline $A{l}_2{O}_3-SrTi{O}_3$ oxide interfaces
• Electronic transport in sub-micrometric channels at the LaAlO${}_3$/SrTiO${}_3$ interface
• Oxide Interface-Based Polymorphic Electronic Devices for Neuromorphic Computing