Abstract
The renaissance of interest in halide perovskites, triggered by their unprecedented performance in optoelectronic applications, elicited worldwide efforts to uncover a variety of intriguing physical properties, with a particular interest in spin-orbit effects. The current work presents the first magneto-optical experimental evidence for anisotropic electron-hole interactions arising from bulk orthorhombic ${\mathrm{MAPbBr}}_{3}$. Magneto-photoluminescence spectra, monitored along with several different crystallographic directions, were dominated by dual exciton emission peaks, while each exhibited a highly nonlinear response to a magnetic field. Moreover, these plots depicted asymmetry from $\ensuremath{-}{B}_{0}$ to $+{B}_{0}$, with a strong dependence on the axis of observations. A theoretical model implementing anisotropy in the electron-hole interaction, Rashba effect, Land\'e $g$ factors, and a lesser contribution from an Overhauser effect, corroborated the experimental results. These research discoveries expand the possible applications of excitons in halide perovskites toward optoelectronic and information devices.
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