Spin control in reduced-dimensional chiral perovskites

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.

Long G, Jiang C, Sabatini R, Yang Z, Wei M, et al. (2018) Spin control in reduced-dimensional chiral perovskites. Nature Photonics 12: 528–533. Available: http://dx.doi.org/10.1038/s41566-018-0220-6.

This publication is based, in part, on work supported by an award (KUS-11-009-21) from the King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, by the Ontario Research Fund (ORF), and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. W.G., C.J. and G.L. acknowledge support from the Singapore National Research Foundation through a 2015 NRF fellowship grant (NRF-NRFF2015-03), Singapore Ministry of Education via an AcRF Tier2 grant (nos. MOE2016-T2-2-077 and MOE2017-T2-1-163) and the A*Star QTE Programme. Q.X. acknowledges financial support from Singapore National Research Foundation via an Investigatorship Award (NRF-NRFI2015-03) and a Competitive Research Programme (NRF-CRP14-2014-03), and the Singapore Ministry of Education through AcRF Tier 2 and Tier 1 grants (MOE2015-T2-1-047 and RG 113/16). G.X. acknowledges financial support from Macau Science and Technology Development Fund (FDCT-116/2016/A3, FDCT-091/2017/A2), a Research Grant (SRG2016-00087-FST, MYRG2018-00148-IAPME) from the University of Macau, the Natural Science Foundation of China (91733302, 61605073 and 2015CB932200) and the Young 1000 Talents Global Recruitment Program of China. X.R.W. acknowledges support from a Nanyang Assistant Professorship grant from Nanyang Technological University and Academic Research Fund Tier 1 (RG108/17S) from the Singapore Ministry of Education. G.L. acknowledges the International Postdoctoral Exchange Fellowship Program of the Office of China Postdoctoral Council. H.Y. acknowledges the Research Foundation-Flanders (FWO Vlaanderen) for a postdoctoral fellowship. The authors thank A.S. Namin (QU), R.G. Sabat (QU), J.-M. Nunzi (QU), A. Xia (ICCAS) and X. Wang (ICCAS) for measuring the room-temperature SPPL. The authors thank C. Zhang (ICCAS) and Z.V. Vardeny (University of Utah) for helpful discussions. The authors also thank E. Palmiano, R. Wolowiec and D. Kopilovic for their help during the course of this study.

Springer Nature

Nature Photonics


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