Domain wall nature of sketched LaAlO3/SrTiO3 nanowires

Abstract

The rich electron correlations and highly coherent transport in reconfigurable devices sketched by a conductive atomic force microscope tip at the LaAlO3/SrTiO3 interface have enabled the oxide platform an ideal playground for studying correlated electrons and quantum technological applications. Why these one-dimensional devices possess enhanced properties over the two-dimensional interface, however, has remained elusive. Here we provide evidence that one-dimensional LaAlO3/SrTiO3 nanowires are intrinsically ferroelastic domain walls by nature through thermodynamic study. We have observed spreading resistance anomalies under thermo-stimulus and temperature cycles, with characteristic temperatures matching domain wall polarity. This information is crucial in understanding the novel phenomena including superconductivity and high mobility quantum transport.

References in corpus (5)

• Magnetic effects at the interface between nonmagnetic oxides
• Magnetic and Superconducting Ordering at LaAlO3/SrTiO3 Interfaces
• Anomalous Transport in Sketched Nanostructures at the LaAlO3/SrTiO3 Interface
• Anisotropic electrical resistance in mesoscopic LaAlO${}_3$/SrTiO${}_3$ devices with individual domain walls
• Electron trapping and detrapping in an oxide two-dimensional electron gas: The role of ferroelastic twin walls