Two-dimensional Square Buckled Rashba Lead Chalcogenides

Abstract

We propose the lead sulphide (PbS) monolayer as a 2D 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 $\Gamma$ points, with large effective Rashba parameters of $\lambda \sim 5$eV$\mathring{A}$ and $\lambda \sim 1$eV$\mathring{A}$, 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 $\Gamma$ 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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• Strain-induced gauge and Rashba fields in ferroelectric Rashba lead chalcogenide PbX monolayers (X = S, Se, Te)
• Uniaxial stress controlled anisotropic Rashba effects and carriers-based currents in BiTeI monolayer semiconductor
• Reversible giant out-of-plane Rashba effect in two-dimensional Ga$XY$ ($X$= Se, Te; $Y$= Cl, Br, I) compounds for persistent spin helix
• Orbital pseudospin-momentum locking in two-dimensional chiral borophene
• Buckling and metastability in membranes with dilation arrays
• Anomalous thermal expansion in Ising-like puckered sheets
• Curvature as an external field in mechanical antiferromagnets
• Twisted Type-II Rashba Homobilayer: A Platform for Tunable Topological Flat Bands
• Two-dimensional metallic ferroelectricity in PbTe monolayer by electrostatic doping