Layer-resolved Electronic Structure of Oxide Heterostructures using High Energy Photoelectron Spectroscopy

Abstract

Over the last few decades, a rapidly expanding field has dealt with emergent properties at various interfaces formed in heterostructured materials. Specifically, it has been shown that an atomically flat interface between two highly insulating oxide materials can exhibit properties not found in either of the bulk systems defining the interface, such properties covering realms of magnetic-nonmagnetic transitions, insulator-metal transitions, emergence of superconductivity, depending on specific systems and synthesis conditions.
Interestingly, there are few investigations to probe the nature of the charge carriers in such systems arising from difficulties inherent in the problem. It is generally challenging to investigate directly the nature of such interface states since these are typically buried under a depth and represent a tiny volume fraction of the entire sample.
Over the last few decades, we have established a way to extract layer-resolved electronic structure information with ...