Publication date: 3rd July 2020
We demonstrate that non-chiral perovskite nanostructures can exhibit circular dichroism (CD) in the absence of a magnetic field and without their activation by chiral molecules. The exciton dispersion in orthorhombic perovskites in the presence of Rashba spin-orbit terms creates helical exciton states, which are split from each other. The splitting can be described as a Zeeman effect in an effective magnetic field, whose direction and magnitude depend on the exciton momentum. The selective excitation of these states by helical light gives rise to CD. Using experimentally determined material parameters, we calculate significant circular dichroism of order 10% in orthorhombic perovskites under off-normal, top illumination. These calculations suggest the effect is observable and CD can be measured in non-chiral perovskite nanostructures such as layered-2D perovskites or nanoplatelets.
P.C.S. acknowledges support from the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE) an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science within the US Department of Energy. Al.L.E. acknowledges support from the US Office of Naval Research and the Laboratory-University Collaboration Initiative (LUCI) program of the DoD Basic Research Office.
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