Manipulating electronic states at oxide interfaces using focused micro X-rays from standard lab-sources

TL;DR

This paper demonstrates that focused laboratory X-ray sources can irreversibly modify the electronic properties of oxide interfaces, enabling defect engineering and potential device patterning in low-dimensional systems.

Contribution

It introduces a novel method of defect-engineering at oxide interfaces using standard lab X-ray sources, expanding applications beyond synchrotron-based techniques.

Findings

X-ray irradiation induces irreversible resistance changes at LaAlO3/SrTiO3 interfaces.

Focused lab X-rays can be used for large-area defect manipulation.

Potential for direct device patterning using lab X-ray sources.

Abstract

Recently, x-ray illumination, using synchrotron radiation, has been used to manipulate defects, stimulate self-organization and to probe their structure. Here we explore a method of defect-engineering low-dimensional systems using focused laboratory-scale X-ray sources. We demonstrate an irreversible change in the conducting properties of the 2-dimensional electron gas at the interface between the complex oxide materials LaAlO3 and SrTiO3 by X-ray irradiation. The electrical resistance is monitored during exposure as the irradiated regions are driven into a high resistance state. Our results suggest attention shall be paid on electronic structure modification in X-ray spectroscopic studies and highlight large-area defect manipulation and direct device patterning as possible new fields of application for focused laboratory X-ray sources.