Rashba Band Splitting In Ch3nh3pbi3: An Insight From Spin Polarized Scanning Tunneling Spectroscopy
NANO LETTERS(2020)
摘要
We report an experimental observation of Rashba splitting in methylammonium lead iodide (MAPbI(3)). Because of a large spin-orbit coupling parameter in the noncentrosymmetric material, both of the bands were predicted to split having two different spin-textures leading to two different Z-components of total angular momentum (J(Z)). We use spin-polarized scanning tunneling spectroscopy to probe only one-type of J(Z)-matched bands throughout the film; dI/dV spectra recorded at many different points of a film however allowed us to spot both the Rashba split-levels and also deliberate on their spin-textures. We observe that the bands split in such a manner that the conduction and valence bands closer to the Fermi energy have the same type of spin-textures (a spin-allowed transition model). Still a low recombination rate of photogenerated carriers in MAPbI(3) has been analyzed by considering Wannier-type excitons, a molecular nature of spin-domains from dI/dV images, and therefore a spin-forbidden nature of interdomain transition.
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关键词
Rashba band splitting, spin-polarized scanning tunneling spectroscopy, spin-orbit coupling in CH3NH3PbI3, conservation of total angular momentum, spin-forbidden interdomain transition
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