Electron Pairing and Superconductivity at the LAO/STO Interface

05.07.2019 09:30 – 11:00

The existence of superconductivity in degenerately doped SrTiO3 (STO) has inspired and mystified researchers for more than half a century. A resurgence of interest was triggered by the development of STO-based heterostructures and nanostructures, where gate-tunable superconductivity could be investigated in more detail. We have been investigating the properties of conductive nanostructures formed by conductive atomic force microscope (c-AFM) lithography. Our investigations have revealed a robust phase in which electrons are paired in the absence of superconductivity. Superconductivity itself has been investigated in the 1D-2D limits, and we have found compelling evidence for an intrinsic 1D nature of pairing and superconductivity. The boundaries of conducting channels, both in 1D and in 2D, coincide with ferroelastic domain walls. Fluctuations of these domain walls, which form a real-space Lifshitz boundary between dxy conducting layers and dxz/dyz insulating regions, are a prime “suspect” in the hunt for the superconducting pairing glue.

Lieu

Bâtiment: Ecole de Physique

auditoire Stuckelberg

entrée libre