Switchable S = 1/2 and J = 1/2 Rashba bands in ferroelectric halide perovskites.

ABSTRACT: 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 conducti

SUBMITTER: Kim M 

PROVIDER: S-EPMC4024856 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature