Liubov Lokot

Exciton insulator states in ZnO/(Zn,Mg)O quantum wells, F1000Physics: Condens. Matter; F1000.com/Workspace;

Blog Post created by Liubov Lokot on Jul 24, 2017

In this paper a theoretical studies of the space separation of electron and hole wave functions in the quantum well ZnO/Mg_{0.27}Zn_{0.73}O are presented. For this aim the self-consistent solution of the Schrödinger 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.

 

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