Title | Electronic spin coherent evolution in MAPI perovskites
Date | December 5, 2022
Abstract |Nowadays hybrid metal halide perovskites, such as methylammonium lead iodide CH3NH3PbI3 (MAPI) are the center of many studies due to their outstanding optoelectronic properties as the large and tunable spin-orbit coupling, spin dependent optical selection rules, and predicted electrically tunable Rashba spin splitting [1,2]. Because of the presence of heavy atoms (Pb, I), spin-orbit coupling is very important in lead perovskite materials and makes then possible the optical generation of electronic spins [3]. In this webinar we will discuss the measured transversal spin coherence time in MAPI polycrystalline films by means of a photo-induced Faraday rotation technique (PFR) [4] Thanks to the picosecond resolution of the experimental technique, we can select different excitation energies with a bandwidth of about 1 meV. We have found that is possible to tune, in this way, the coherent electronic spin evolution signal by exciting at different energies. We demonstrate the optical orientation of localized electrons and holes in this perovskite material at low temperature.
[1] Kepenekian, M. et al., Rashba and Dresselhaus effects in hybrid organic inorganic perovskites : from basics to devices, ACS Nano 2015, 9, 11557−11567.
[2] Kepenekian, M. et al., Rashba and Dresselhaus couplings in Halide perovskites : Accomplishments and opportunities for spintronics and spin-orbitronics, J. Phys. Chem. Lett. 2017, 8 (14), 3362− 3370.
[3] Odenthal, P. et al., Spin-polarized exciton quantum beating in hybrid organic−inorganic perovskites. Nat. Phys. 2017, 13, 894−899.
[4] G. Garcia-Arellano, et al., Energy tuning of electronic spin coherent evolution in methylammonium lead iodide perovskites, The Journal of Physical Chemistry Letters 12 (34), 8272-8279
