Anomalous Transport in Sketched Nanostructures at the LaAlO3/SrTiO3 Interface

Abstract

The oxide heterostructure LaAlO3/SrTiO3 supports a two-dimensional electron liquid with a variety of competing phases including magnetism, superconductivity and weak antilocalization due to Rashba spin-orbit coupling. Further confinement of this 2D electron liquid to the quasi-one-dimensional regime can provide insight into the underlying physics of this system and reveal new behavior. Here we describe magnetotransport experiments on narrow LaAlO3/SrTiO3 structures created by a conductive atomic force microscope lithography technique. Four-terminal local transport measurements on ~10-nm-wide Hall bar structures yield longitudinal resistances that are comparable to the resistance quantum h/e2 and independent of the channel length. Large nonlocal resistances (as large as 10^4 ohms) are observed in some but not all structures with separations between current and voltage that are large compared to the 2D mean-free path. The nonlocal transport is strongly suppressed by the onset of superconductivity below ~200 mK. The origin of these anomalous transport signatures is not understood, but may arise from coherent transport defined by strong spin-orbit coupling and/or magnetic interactions.

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Cited by in corpus (9)

• Colloquium: Topological Band Theory
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Anomalous Hall effect in 2D Rashba ferromagnet
• Micrometer-scale ballistic transport of electron pairs in LaAlO3/SrTiO3 nanowires
• Anomalous magnetic ground state in LaAlO3/SrTiO3 interface probed by transport through nanowires
• Superconducting LaAlO3/SrTiO3 Nanowires
• Domain wall nature of sketched LaAlO3/SrTiO3 nanowires
• Topological quantum switch and controllable quasi 1D wires in antimonene
• Reconfigurable Oxide Nanoelectronics by Tip-induced Electron Delocalization