Tunable exciton interactions in optical lattices with polar molecules

TL;DR

This paper demonstrates how electric fields can tune non-linear exciton interactions in polar molecule optical lattices, enabling control over exciton pairing and biexciton formation for quantum applications.

Contribution

It introduces a method to control exciton-exciton interactions via electric fields, facilitating the formation of biexcitons in optical lattices with polar molecules.

Findings

Exciton interactions can be tuned by electric fields.

Electric fields induce exciton pairing and biexciton formation.

Potential applications in entangled quasiparticles and quantum energy transport.

Abstract

Rotational excitation of polar molecules trapped in an optical lattice gives rise to rotational excitons. Here we show that non-linear interactions of such excitons can be controlled by an electric field. The exciton--exciton interactions can be tuned to induce exciton pairing, leading to the formation of biexcitons. Tunable non-linear interactions between excitons can be used for many applications ranging from the controlled preparation of entangled quasiparticles to the study of polaron interactions and the effects of non-linear interactions on quantum energy transport in molecular aggregates.