Exciton insulator states for particle-hole pair in ZnO/(Zn,Mg)O quantum wells and for Dirac cone

TL;DR

This paper presents a theoretical study of exciton insulator states in ZnO/(Zn,Mg)O quantum wells, highlighting electron-hole pairing, energy gaps, and the potential for Cooper instability due to particle-hole interactions.

Contribution

It introduces a self-consistent approach to analyze electron-hole wave function separation and predicts exciton insulator states with a specific energy gap in ZnO-based quantum wells.

Findings

Predicted exciton insulator gap of 3.4 eV.

Electron-hole pairing increases energy by 0.2 meV.

Particle-hole pairing induces Cooper instability.

Abstract

In this paper a theoretical studies of the space separation of electron and hole wave functions in the quantum well ZnO/Mg0.27Zn0.73O are presented. For this aim the self-consistent solution of the Schr\"odinger equations for electrons and holes and the Poisson equations at the presence of spatially varying quantum well potential due to the piezoelectric effect and local exchange-correlation potential is found. The one-dimensional Poisson equation contains the Hartree potential which includes the one-dimensional charge density for electrons and holes along the polarization field distribution. The three-dimensional Poisson equation contains besides the one-dimensional charge density for electrons and holes the exchange-correlation potential which is built on convolutions of a plane-wave part of wave functions in addition. In ZnO/(Zn,Mg)O quantum well the electron-hole pairing leads to the exciton insulator states. An exciton insulator states with a gap 3.4 eV are predicted. If the electron and hole are separated, their energy is higher on 0.2 meV than if they are paired. The particle-hole pairing leads to the Cooper instability.