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Oleg Rubel1

1, McMaster University, Hamilton, Ontario, Canada

Dresselhaus-Rashba semiconductors with a strong spin-orbit interaction are actively studied for applications in spintronic devices [1]. In semiconductors that lack spatial inversion symmetry, bulk spin-orbit coupling becomes odd in the electron's momentum, which gives rise to a splitting of the spin sub-bands in energy. Application of this effect to solar cells can lead to the development of new high-efficiency materials. Such materials are expected to combine benefits of direct and indirect band gap semiconductors, namely a very long lifetime of optical excitations and the strong optical absorption.

It is believed that an exceptionally long lifetime of optical excitations in hybrid halide perovskites is associated with the presence of a Dresselhaus-Rashba splitting at the band edges [2,3]. In this presentation, I will analyze the structural origin and chemical trends of the Dresselhaus-Rashba effect in perovskites, robustness of the splitting with respect to a dynamic disorder, as well as consequences of the spin texture for the radiative recombination of optical excitations.

[1] A. Manchon, H. C. Koo, J. Nitta, S. M. Frolov, and R. A. Duine, Nat. Mater. 14, 871 (2015).
[2] O. Rubel and A. Bokhanchuk, arXiv 1508.03612 (2015).
[3] D. Niesner, M. Wilhelm, I. Levchuk, A. Osvet, S. Shrestha, M. Batentschuk, C. Brabec, and T. Fauster, Phys. Rev. Lett. 117, 1 (2016).

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