Transient quantum beatings of trions in hybrid organic tri-iodine perovskite single crystal.
Uyen N HuynhYe LiuAshish ChananaDipak R KhanalPeter C SercelJinsong HuangZeev Valy VardenyPublished in: Nature communications (2022)
Utilizing the spin degree of freedom of photoexcitations in hybrid organic inorganic perovskites for quantum information science applications has been recently proposed and explored. However, it is still unclear whether the stable photoexcitations in these compounds correspond to excitons, free/trapped electron-hole pairs, or charged exciton complexes such as trions. Here we investigate quantum beating oscillations in the picosecond time-resolved circularly polarized photoinduced reflection of single crystal methyl-ammonium tri-iodine perovskite (MAPbI 3 ) measured at cryogenic temperatures. We observe two quantum beating oscillations (fast and slow) whose frequencies increase linearly with B with slopes that depend on the crystal orientation with respect to the applied magnetic field. We assign the quantum beatings to positive and negative trions whose Landé g-factors are determined by those of the electron and hole, respectively, or by the carriers left behind after trion recombination. These are [Formula: see text] = 2.52 and [Formula: see text]= 2.63 for electrons, whereas [Formula: see text]= 0.28 and [Formula: see text]= 0.57 for holes. The obtained g-values are in excellent agreement with an 8-band K.P calculation for orthorhombic MAPbI 3 . Using the technique of resonant spin amplification of the quantum beatings we measure a relatively long spin coherence time of ~ 11 (6) nanoseconds for electrons (holes) at 4 K.
Keyphrases
- molecular dynamics
- energy transfer
- solar cells
- room temperature
- density functional theory
- monte carlo
- smoking cessation
- human milk
- working memory
- single molecule
- dna damage
- magnetic resonance imaging
- ionic liquid
- water soluble
- blood brain barrier
- oxidative stress
- perovskite solar cells
- brain injury
- social media
- nucleic acid