Two-dimensional square buckled Rashba lead chalcogenides
Hanakata, Paul Z.
Rodin, A. S.
Park, Harold S.
Campbell, David K.
Castro Neto, A. H.
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Citation (published version)Paul Z Hanakata, A.S. Rodin, Alexandra Carvalho, Harold S Park, David K Campbell, A.H. Castro Neto. 2017. "Two-dimensional square buckled Rashba lead chalcogenides." PHYSICAL REVIEW B, Volume 96, Issue 16, pp. ? - ? (6). https://doi.org/10.1103/PhysRevB.96.161401
We propose the lead sulphide (PbS) monolayer as a two-dimensional semiconductor with a large Rashba-like spin-orbit effect controlled by the out-of-plane buckling. The buckled PbS conduction band is found to possess Rashba-like dispersion and spin texture at the M and Γ points, with large effective Rashba parameters of λ∼5 eV Å and λ∼1 eV Å, respectively. Using a tight-binding formalism, we show that the Rashba effect originates from the very large spin-orbit interaction and the hopping term that mixes the in-plane and out-of-plane p orbitals of Pb and S atoms. The latter, which depends on the buckling angle, can be controlled by applying strain to vary the spin texture as well as the Rashba parameter at Γ and M. Our density functional theory results together with tight-binding formalism provide a unifying framework for designing Rashba monolayers and for manipulating their spin properties.
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