Electron-Hole Liquids in Transition Metal Oxide Heterostructures

TL;DR

This paper discusses the potential for creating spatially separated electron-hole liquids in transition metal oxide heterostructures, which could lead to novel excitonic properties and significant photovoltaic effects.

Contribution

It introduces the concept of electron-hole liquids in transition metal oxide heterostructures and explores their potential for novel excitonic states and photovoltaic applications.

Findings

Feasible spatial separation of electrons and holes in heterostructures

Conditions favoring excitonic state formation identified

Potential for large photovoltaic effects discussed

Abstract

Appropriately designed transition metal oxide heterostructures involving small band gap Mott insulators are argued to support spatially separated electron and hole gasses at equilibrium. Spatial separations and carrier densities favoring the formation of excitonic states are achievable. The excitonic states may exhibit potentially novel properties. Energetic estimates are given, candidate material systems are discussed, and the possibility of large photvoltaic effects is mentioned