Spin control in reduced-dimensional chiral perovskites
Guankui Long, Chongyun Jiang, Randy Sabatini, Zhenyu Yang, Mingyang Wei, Li Na Quan, Qiuming Liang, Abdullah Rasmita, Mikhail Askerka, Grant Walters, Xiwen Gong, Jun Xing, Xinglin Wen, Rafael Quintero-Bermudez, Haifeng Yuan, Guichuan Xing, X. Renshaw Wang, Datong Song, Oleksandr Voznyy, Mingtao Zhang, Sjoerd Hoogland, Weibo Gao, Qihua Xiong, Edward H. Sargent
Hybrid organic–inorganic perovskites exhibit strong spin–orbit coupling1, spin-dependent optical selection rules2,3 and large Rashba splitting4,5,6,7,8. These characteristics make them promising candidates for spintronic devices9 with photonic interfaces. Here we report that spin polarization in perovskites can be controlled through chemical design as well as by a magnetic field. We obtain both spin-polarized photon absorption and spin-polarized photoluminescence in reduced-dimensional chiral perovskites through combined strategies of chirality transfer and energy funnelling. A 3% spin-polarized photoluminescence is observed even in the absence of an applied external magnetic field owing to the different emission rates of σ+ and σ− polarized photoluminescence. Three-dimensional perovskites achieve a comparable degree of photoluminescence polarization only under an external magnetic field of 5 T. Our findings pave the way for chiral perovskites as powerful spintronic materials.
Circular dichroism, Stereochemistry, Cotton effect, Materials, Organic chemistry