# Charge transfer driven emergent phenomena in oxide heterostructures

## TL;DR

This paper reviews how charge transfer at oxide interfaces leads to novel emergent phenomena in heterostructures, combining theoretical and experimental insights to understand and predict interfacial properties.

## Contribution

It provides a comprehensive overview of mechanisms, experimental measurements, and theoretical methods related to charge transfer in oxide heterostructures, highlighting recent progress and future challenges.

## Key findings

- Charge transfer induces diverse interfacial phenomena not seen in bulk oxides.
- Theoretical methods have successfully modeled charge transfer but face challenges.
- Experimental studies confirm charge transfer effects across various oxide interfaces.

## Abstract

Complex oxides exhibit many intriguing phenomena, including metal-insulator transition, ferroelectricity/multiferroicity, colossal magnetoresistance and high transition temperature superconductivity. Advances in epitaxial thin film growth techniques enable us to combine different complex oxides with atomic precision and form an oxide heterostructure. Recent theoretical and experimental work has shown that charge transfer across oxide interfaces generally occurs and leads to a great diversity of emergent interfacial properties which are not exhibited by bulk constituents. In this report, we review mechanisms and physical consequence of charge transfer across interfaces in oxide heterostructures. Both theoretical proposals and experimental measurements of various oxide heterostructures are discussed and compared. We also review the theoretical methods that are used to calculate charge transfer across oxide interfaces and discuss the success and challenges in theory. Finally, we present a summary and perspectives for future research.