Existence of Unexcited and Excited Biexcitons in Molecular Crystals

TL;DR

This paper revisits four-body system theory to rigorously prove the existence of ground state biexcitons in molecular crystals and predicts the potential existence of excited biexcitons, supported by computational validation.

Contribution

It extends the four-body theory to predict excited biexcitons and develops a computational model to validate these predictions.

Findings

Ground state biexcitons are rigorously proven to exist in molecular crystals.

Computational results confirm the theory for specific parameters.

Potential for experimental realization and industrial applications.

Abstract

The theory of four-body systems is revisited. It is illustrated that the theory provides a rigorous proof for the formation of ground state (unexcited) biexcitons in molecular crystals. The generalization of the theory predicts the possible existence of excited biexcitons in nature. In order to test the validity of the extended theory on computational level, a very elaborate computer code is constructed for the treatment of arbitrary four-body system with arbitrary electron/hole mass ratio and arbitrary exciton - exciton interaction (VXX). The results, for mass ratio = 1 and VXX is a pure Coulomb force, show that the test is successful. Realization of these conclusions on experimental level should open the door for wide industrial applications.