Chiral perovskite excitons show circular dichroism only when Rashba-like and chiral spin-texture terms act together, while perovskite nanocrystals can get CD from shape and exchange effects without spin splitting.
E.; Levin, A.; Brunecky, R.; Berry, J.J.; Mitzi, D
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Optical activity of chiral excitons
Chiral perovskite excitons show circular dichroism only when Rashba-like and chiral spin-texture terms act together, while perovskite nanocrystals can get CD from shape and exchange effects without spin splitting.