Nanoscale control of the metal-insulator transition at LAO/KTO (110) and LAO/KTO (111) interfaces

Abstract

Recent reports of superconductivity at KTaO3 (KTO) (110) and (111) interfaces have sparked intense interest due to the relatively high critical temperature as well as other properties that distinguish this system from the more extensively studied SrTiO3 (STO)-based heterostructures. Here we report nanoscale control of the metal-to-insulator transition at the LaAlO3/KTO (110) and (111) interfaces. Devices are created using two distinct methods previously developed for STO-based heterostructures: (1) conductive atomic-force microscopy lithography and (2) ultra-low-voltage electron-beam lithography. At low temperatures, KTO-based devices show superconductivity that is tunable by an applied back gate. A nanowire device shows single-electron-transistor (SET) behavior. These reconfigurable methods of creating nanoscale devices in KTO-based heterostructures offer new avenues for investigating mechanisms of superconductivity as well as development of quantum devices that incorporate strong spin-orbit interactions, superconducting behavior, and nanoscale dimensions.

19 pages, 9 figures

References in corpus (7)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Surface defects and conduction in polar oxide heterostructures
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Anomalous magnetic ground state in LaAlO3/SrTiO3 interface probed by transport through nanowires
• Irreversible multi-band effects and Lifshitz transitions at the LaAlO3/SrTiO3 interface under field effect

Cited by in corpus (5)

• Superconducting quantum oscillations and anomalous negative magnetoresistance in a honeycomb nanopatterned oxide interface superconductor
• Universally enhanced superconductivity and coexisting ferroelectricity at oxide interfaces
• Josephson junction arrays as a platform for topological phases of matter
• High-quality Nano-patterning of Oxide Interfaces Using Transferred Gold Mask
• Reconfigurable Oxide Nanoelectronics by Tip-induced Electron Delocalization