Importance of Spin-Orbit Interaction for the Electron Spin Relaxation in Organic Semiconductors
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AuthorNuccio, Laura; Willis, Martin R.; Schulz, Leander; Fratini, Simone; Messina, Fabrizio; D'Amico, Michele; Pratt, Francis Laurence; Lord, James S.; Mckenzie, Iain D.; Loth, Marsha A.; Purushothaman, Balaji; Anthony, John E.; Heeney, Martin J.; Wilson, R. M.; Hernández Campo, Ignacio; Cannas, Marco; Sedlak, Kamil; Kreouzis, Theo; Gillin, William P.; [et al.]
Despite the great interest organic spintronics has recently attracted, there is only a partial understanding of the fundamental physics behind electron spin relaxation in organic semiconductors. Mechanisms based on hyperfine interaction have been demonstrated, but the role of the spin-orbit interaction remains elusive. Here, we report muon spin spectroscopy and time-resolved photoluminescence measurements on two series of molecular semiconductors in which the strength of the spin-orbit interaction has been systematically modified with a targeted chemical substitution of different atoms at a particular molecular site. We find that the spin-orbit interaction is a significant source of electron spin relaxation in these materials.
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