Metallic interface in non-SrTiO3 based titanate superlattice

TL;DR

This paper demonstrates the fabrication of high-quality YTiO3/CaTiO3 superlattices that host a two-dimensional electron gas at their interface, expanding the possibilities for studying complex oxide electronic phenomena.

Contribution

It introduces a new non-SrTiO3 based superlattice system with a metallic interface, providing an alternative platform for exploring two-dimensional electron gases in complex oxides.

Findings

Successful fabrication of high-quality YTiO3/CaTiO3 superlattices.

Observation of a two-dimensional electron gas at the interface.

Potential for new insights into exotic many-body phenomena.

Abstract

We report on the fabrication of all perovskite Mott insulator/band insulator YTiO3/CaTiO3 superlattices by pulsed laser deposition. The combination of in situ reflection high energy electron diffraction, X-ray diffraction, and X-ray reflectivity confirms the high quality of the films grown in a layer-by-layer mode. Electrical transport measurements reveal that a non-SrTiO3 based two dimensional electron gas system has formed at the YTiO3/CaTiO3 interface. These studies offer another route in the pursuit of complex oxide two-dimensional electron gas systems, which allows to obtain greater insights into the exotic many-body phenomena at such interfaces.