Many-body Correlation Effects in the Spatially Separated Electron and Hole Layers in the Coupled Quantum Wells

TL;DR

This paper investigates many-body correlation effects in spatially separated electron-hole layers in coupled quantum wells, revealing the ground state as an electron-hole liquid with implications for experimental observations.

Contribution

It provides a theoretical analysis of correlation effects using a many-component model and justifies the RPA approximation in this context.

Findings

Ground state is an electron-hole liquid with lower energy than excitons.

The RPA diagram selection is justified for the system.

Results relate to observed inhomogeneous states in experiments.

Abstract

The many-body correlation effects in the spatially separated electron and hole layers in the coupled quantum wells are investigated. The specific case of the many-component electron-hole system is considered. Keeping the main diagrams in the parameter of the inverse number of components allows us to justify the RPA diagram selection. The ground state of the system is found to be the electron-hole liquid which possesses the energy smaller than the exciton phase. The connection is discussed between the results obtained and the experiments in which the inhomogeneous state in the coupled quantum wells is revealed.