Tunable strongly interacting dipolar excitons in hybrid perovskites

TL;DR

This paper theoretically investigates how hybrid perovskite thin films can have their excitonic nonlinearities tuned via external electric fields, leveraging their layered structure to control exciton interactions and dipole moments.

Contribution

It demonstrates the ability to modulate excitonic responses and induce strongly interacting dipolar excitons in hybrid perovskites through electric field manipulation.

Findings

Electric field causes charge separation and dipole formation in excitons.

Hybrid perovskites exhibit large exciton binding energies (~hundreds of meV).

Tunable nonlinear optical responses are achievable in these materials.

Abstract

We study theoretically the excitonic nonlinearity in hybrid organic-inorganic Ruddlesden-Popper perovskite thin films. The composite layered structure of these materials allows for flexible modulation of their excitonic response between the limiting cases of single atomic layer and wide quasi-two-dimensional quantum well. In particular, we demonstrate that transverse electric field leads to the spatial separation of charge carriers within the inorganic layer, giving rise to strongly interacting excitons possessing built-in dipole moment. Combined with exciton binding energy of the order of hundreds of meVs, this makes hybrid perovskites an optimal platform for tailoring of nonlinear optical response at reduced dimensionality.