Tunneling into a quantum confinement created by a single-step nano-lithography of conducting oxide interfaces

Abstract

A new nano-lithography technique compatible with conducting oxide interfaces, which requires a single lithographic step with no additional amorphous layer deposition or etching, is presented. It is demonstrated on SrTiO3/LaAlO3 interface where a constriction is patterned in the electron liquid. We find that an additional back-gating can further confine the electron liquid into an isolated island. Conductance and differential conductance measurements show resonant tunneling through the island. The data at various temperatures and magnetic fields are analyzed and the effective island size is found to be of the order of 10nm. The magnetic field dependence suggests absence of spin degeneracy in the island. Our method is suitable for creating superconducting and oxide-interface based electronic devices.

arXiv comment6 pages, 5 figures

References in corpus (13)

• Tunable Rashba spin-orbit interaction at oxide interfaces
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• The role of oxygen vacancies in SrTiO3 at the LaAlO3/SrTiO3 interface
• Fano Resonances in Electronic Transport through a Single Electron Transistor
• Coulomb-Modified Fano Resonance in a One-Lead Quantum Dot
• Critical thickness for ferromagnetism in LaAlO3/SrTiO3 heterostructures
• Anisotropic magneto-transport effects at SrTiO3\LaAlO3 interfaces
• Two-dimensional electron liquid state at LaAlO3-SrTiO3 interfaces
• Strong correlations elucidate the electronic structure and phase-diagram of LaAlO3/SrTiO3 interface
• One-dimensional Quantum Wire Formed at the Boundary Between Two Insulating LaAlO3/SrTiO3 Interfaces
• Anomalous magnetic ground state in LaAlO3/SrTiO3 interface probed by transport through nanowires
• Anomalous response to gate voltage application in mesoscopic LaAlO_3/SrTiO_3 devices

Cited by in corpus (9)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Superconducting quantum point contact with split gates in the two dimensional LaAlO3/SrTiO3 superfluid
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Electric dipole spin resonance in single and two electron quantum dot defined in two-dimensional electron gas at the SrTiO${}_3$/LaAlO${}_3$ interface
• Nanoscale tunnel field effect transistor based on a complex oxide lateral heterostructure
• Solution Monolayer Epitaxy for Tunable Atomically Sharp Oxide Interfaces
• Scanning gate microscopy probing of anisotropic electron flow in a two dimensional electron gas at the (110) ${\mathrm{LaAlO}}_3/{\mathrm{SrTiO}}_3$ interface: A theoretical investigation
• Imaging GHz surface acoustic wave modes in electrostricted LaAlO${}_3$/SrTiO${}_3$ heterostructures
• High-quality Nano-patterning of Oxide Interfaces Using Transferred Gold Mask