biostudies-literatureUnknown111(19)Kim MThe Rashba effect is spin degeneracy lift originated from spin-orbit coupling under inversion symmetry breaking and has been intensively studied for spintronics applications. However, easily implementable methods and corresponding materials for directional controls of Rashba splitting are still lacking. Here, we propose organic-inorganic hybrid metal halide perovskites as 3D Rashba systems driven by bulk ferroelectricity. In these materials, it is shown that the helical direction of the angular momentum texture in the Rashba band can be controlled by external electric fields via ferroelectric switching. Our tight-binding analysis and first-principles calculations indicate that S = 1/2 and J = 1/2 Rashba bands directly coupled to ferroelectric polarization emerge at the valence and conductiProceedings of the National Academy of Sciences of the United States of America6900-4https://www.ebi.ac.uk/biostudies/studies/S-EPMC4024856biostudies-literatureSwitchable S = 1/2 and J = 1/2 Rashba bands in ferroelectric halide perovskites.PMC4024856Jin HIm JIhm JKim MFreeman AJfalseSwitchable S = 1/2 and J = 1/2 Rashba bands in ferroelectric halide perovskites.The Rashba effect is spin degeneracy lift originated from spin-orbit coupling under inversion symmetry breaking and has been intensively studied for spintronics applications. However, easily implementable methods and corresponding materials for directional controls of Rashba splitting are still lacking. Here, we propose organic-inorganic hybrid metal halide perovskites as 3D Rashba systems driven by bulk ferroelectricity. In these materials, it is shown that the helical direction of the angular momentum texture in the Rashba band can be controlled by external electric fields via ferroelectric switching. Our tight-binding analysis and first-principles calculations indicate that S = 1/2 and J = 1/2 Rashba bands directly coupled to ferroelectric polarization emerge at the valence and conducti2014-01-01T00:00:00Z2014 May2025-04-05T13:37:29.823Z2019-03-27T01:28:26ZS-EPMC40248562478529410.1073/pnas.1405780111