Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.117
Publication date: 7th February 2022
The renaissance of interest in halide perovskites, triggered by the discovery of their unprecedented performance in opto-electronic applications, elicited worldwide efforts to uncover a variety of intriguing physical properties, with a special interest about spin-orbit and Rashba/Dresselhaus effects. The current work presents for the first-time magneto-optical experimental evidence for non- uniaxial Rashba field with surplus contribution by a Dresselhaus effect arising from the bulk of MAPbBr3. Magneto-photoluminescence (MPL) spectra, monitored along several different crystallographic directions, were dominated by dual exciton emission peaks, while each exhibited a highly non-linear response to a magnetic field, with distinguished behavior at extreme points. Moreover, these plots depicted anisotropy from-B0 to +B0, with strong dependence on the axis of observations. Furthermore, ground state electron spin resonance spectroscopy, illustrated resonances bands coinciding with the extreme points in the MPL spectrum. Those resonance appeared only after illumination and disappeared a few hours later, designating an association with electron-nuclear coupling (the Overhauser effect. A theoretical model corroborating the experimental results, implementing anisotropic Rashba/Dresselhaus terms, anisotropy in the Landé g-factors, and a lesser contribution from an Overhauser effect, corroborated the experimental results. The origin of the Rashba/Dresselhaus effects in the bulk of halide perovskites is assumed to be attributed to the presence of grain boundaries. The research discoveries put a basic ground for expansion of possible applications of the halide perovskites toward spin-base devices.
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