Micrometer-scale ballistic transport of electron pairs in LaAlO3/SrTiO3 nanowires

Abstract

High-mobility complex-oxide heterostructures and nanostructures offer new opportunities for extending the paradigm of quantum transport beyond the realm of traditional III-V or carbon-based materials. Recent quantum transport investigations with LaAlO${}_3$/SrTiO${}_3$-based quantum dots have revealed the existence of a strongly correlated phase in which electrons form spin-singlet pairs without becoming superconducting. Here we report evidence for micrometer-scale ballistic transport of electron pairs in quasi-one-dimensional (quasi-1D) LaAlO${}_3$/SrTiO${}_3$ nanowire cavities. In the paired phase, Fabry-Perot-like quantum interference is observed, in sync with conductance oscillations observed in the superconducting regime (at zero magnetic field). Above a critical magnetic field $B_p$, electron pairs unbind and conductance oscillations shift with magnetic field. These experimental observations extend the regime of ballistic electronic transport to strongly correlated phases.

5 pages, 3 figures; Also includes Supplemental Information

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Cited by in corpus (14)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• One-Dimensional Nature of Pairing and Superconductivity at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Superconducting quantum point contact with split gates in the two dimensional LaAlO3/SrTiO3 superfluid
• Shubnikov-de Haas-like Quantum Oscillations in Artificial One-Dimensional LaAlO3/SrTiO3 Electron Channels
• Revealing attractive electron-electron interaction in a quantum dot by full counting statistics
• Attractive and driven interaction in quantum dots: mechanisms for geometric pumping
• Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias
• Coexistence of $s$-wave superconductivity and phase separation in the half-filled extended Hubbard model with attractive interactions
• Quantised conductance of one-dimensional strongly-correlated electrons in an oxide heterostructure
• Direct Imaging of Sketched Conductive Nanostructures at the LaAlO3/SrTiO3 Interface
• Domain wall nature of sketched LaAlO3/SrTiO3 nanowires
• Electronic transport in sub-micrometric channels at the LaAlO${}_3$/SrTiO${}_3$ interface
• Strong Aharonov-Bohm quantum interference in simply-connected LaAlO${}_3$/SrTiO${}_3$ structures
• Graphene-Complex-oxide Nanoscale Device Concepts