Magneto-Optics of Anisotropic Exciton Polaritons in Two-Dimensional Perovskites

TL;DR

This paper models the magneto-optical behavior of exciton polaritons in 2D perovskites under in-plane magnetic fields, revealing anisotropic polariton branches and the potential for strong coupling of dark excitons.

Contribution

It introduces a combined microscopic and Maxwell's equations approach to explore magneto-optics in 2D perovskites, highlighting magnetic field effects on exciton polaritons.

Findings

Brightened dark exciton can enter strong coupling regime

Magnetic field induces anisotropic polariton branches

Polarization mixing and symmetry breaking observed

Abstract

Layered 2D organic-inorganic perovskite semiconductors support strongly confined excitons that offer significant potential for ultrathin polaritonic devices due to their tunability and huge oscillator strength. The application of a magnetic field has proven to be an invaluable tool for investigating the exciton fine structure observed in these materials. Yet, the combination of an in-plane magnetic field and the strong coupling regime has remained largely unexplored. In this work, we combine microscopic theory with a rigorous solution of Maxwell's equations to model the magneto-optics of exciton polaritons in 2D perovskites. We predict that the brightened dark exciton state can enter the strong coupling regime. Furthermore, the magnetic-field-induced mixing of polarization selection rules and the breaking of in-plane symmetry lead to highly anisotropic polariton branches. This study contributes to a better understanding of the exciton fine structure in 2D perovskites and demonstrates the cavity control of highly anisotropic and polarization-sensitive exciton polaritons.