An international research team from TU DortÂmund UniÂverÂsity, the Russian Academy of Sciences and ETH ZÃ¼rich has disÂcovÂered that the electron dynamics in perovskite crystals are largely determined by lead. This discovery suggests that replacing this element could enable better control of the crystals' material properties.
TU DortÂmund UniÂverÂsity Professor Dmitri Yakovlev's group investigated ultrafast interaction processes between optically excited charge carriers and their surroundings in perovskite crystals. The team was able to show that the magnetic properties can be regulated on an ultrafast time scale through the use of optical pulses with a duration of trillionths of a second. This proof that they can be conÂtrolled is of particular interest for possible new applications.
In addition, it was found that the lifetime of the magnetization of optically generated charge carriers is limited if they interact with nuclear spins. By far the most acute losses were observed in the interaction with the nuclear spin of lead. Thanks to this insight, researchers can now further investigate and develop the material in a targeted manner, by replacing lead with other elements in a series of tests.