Strong Aharonov-Bohm quantum interference in simply-connected LaAlO${}_3$/SrTiO${}_3$ structures

Abstract

We report Aharonov-Bohm (AB)-type quantum interference in simply-connected devices created at the LaAlO${}_3$/SrTiO${}_3$ interface using conductive-atomic force microscope (c-AFM) lithography. The oscillations are multi-periodic functions of magnetic field strength, and they exhibit a substantial magnetic hysteresis with frequencies that depends on the magnetic sweep direction. The oscillation amplitude for the lowest two frequencies approaches $e^2/h$, consistent with the theoretical maximum for the AB effect, and harmonics up to third order are observable. Broadband quasiperiodic behavior is reported in a fraction of simply-connected electron waveguide devices that exhibit magnetic asymmetries. Curiously, nanoscale ring devices that are multiply-connected lack signatures of AB quantum interference. The interference phenomena are associated with an inhomogeneous magnetic landscape within the LaAlO${}_3$/SrTiO${}_3$ nanostructures.

arXiv comment5 pages, 3 figures, Supplementary materials

References in corpus (20)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Aharonov-Bohm effect in graphene
• 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
• "Water-cycle" mechanism for writing and erasing nanostructures at the LaAlO3/SrTiO3 interface
• Local Electrostatic Imaging of Striped Domain Order in LaAlO3/SrTiO3
• Shubnikov-de Haas oscillations in SrTiO3\LaAlO3 interface
• Nanoscale Phenomena in Oxide Heterostructures
• Imaging and tuning polarity at SrTiO3 domain walls
• Quantum interference in an interfacial superconductor
• Micrometer-scale ballistic transport of electron pairs in LaAlO3/SrTiO3 nanowires
• Phase coherent transport in SrTiO3/LaAlO3 interfaces
• Aharonov-Bohm oscillations and magnetic focusing in ballistic graphene rings
• Shubnikov-de Haas-like Quantum Oscillations in Artificial One-Dimensional LaAlO3/SrTiO3 Electron Channels

Cited by in corpus (2)

• Electronic subbands in the a-LaAlO${}_3$/KTaO${}_3$ interface revealed by quantum oscillations in high magnetic fields
• Electrostatic gate-controlled quantum interference in a high-mobility two-dimensional electron gas at the (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)O${}_3$/SrTiO${}_3$ interface