# Two-dimensional superconductivity at the (111)LaAlO$_3$/SrTiO$_3$ interface

## TL;DR

This study reports the discovery of two-dimensional superconductivity at the (111)LaAlO$_3$/SrTiO$_3$ interface, characterized by a Berezinskii-Kosterlitz-Thouless transition and anisotropic critical magnetic fields, offering insights into the microscopic mechanisms involved.

## Contribution

It introduces the (111)LaAlO$_3$/SrTiO$_3$ interface as a new platform for studying 2D superconductivity and its relation to orbital symmetry.

## Key findings

- Superconductivity at the interface exhibits a BKT transition.
- The superconducting layer thickness is approximately 10 nm.
- The coherence length is estimated at 60 nm.

## Abstract

We report on the discovery and transport study of the superconducting ground state present at the (111)LaAlO$_3$/SrTiO$_3$ interface. The superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition and its 2D nature is further corroborated by the anisotropy of the critical magnetic field, as calculated by Tinkham. The estimated superconducting layer thickness and coherence length are 10 nm and 60 nm, respectively. The results of this work provide a new platform to clarify the microscopic details of superconductivity at LaAlO$_3$/SrTiO$_3$ interfaces, in particular in what concerns the link with orbital symmetry.