Quantum Wells in Polar-Nonpolar Oxide Heterojunction Systems

TL;DR

This paper investigates the electronic structure of quantum wells in polar-nonpolar oxide heterojunctions, revealing diverse two-dimensional electron systems influenced by band alignment and interface geometry.

Contribution

It provides a detailed density functional analysis of quantum wells in polar-nonpolar oxide systems, highlighting the dependence of electron systems on interface properties.

Findings

Different 2D electron systems can form at oxide interfaces.

Band line-ups and interface geometry critically influence electronic behavior.

Density functional methods effectively model these heterojunctions.

Abstract

We address the electronic structure of quantum wells in polar-nonpolar oxide heterojunction systems focusing on the case of non-polar BaVO$_3$ wells surrounded by polar LaTiO$_3$ barriers. Our discussion is based on a density functional description using the local spin density approximation with local correlation corrections (LSDA+U). We conclude that a variety of quite different two-dimensional electron systems can occur at interfaces between insulating materials depending on band line-ups and on the geometrical arrangement of polarity discontinuities.