Anisotropic Rashba splitting dominated by out-of-plane spin polarization in two-dimensional Janus $X{A}_{2}Y$ ($A$= Si, Sn, Ge; $X,Y$= Sb, Bi) with surface imperfection

Abstract

The anisotropic Rashba effect allows for the manipulation of electron spins in a more precise and tunable manner since the magnitude of the Rashba splitting and orientation of the spin textures can be simply controlled by tuning the direction of the externally applied electric field. Herein, we predict the emergence of the anisotropic Rashba effect in the two-dimensional (2D) Janus $X{A}_{2}Y$ constructed from the group IV ($A$= Si, Sn, Ge) and group V ($X,Y$ = Sb, Bi) elements having trigonal prismatic structures but lacking in-plane mirror symmetry. Due to the lowering point group symmetry of the crystal, the Rashba spin splitting is enforced to becomes anisotropic around certain high symmetry points in the Brillouin zone and preserves the out-of-plane spin textures. We illustrate this behavior using density functional theory calculations supplemented with $\vec{k}\cdot \vec{p}$ analysis on the Janus SbSi${}_2$Bi monolayer as a representative example. Specifically, we observed large and anisotropic Rashba splitting with prominence contribution of the out-of-plane spin textures in the conduction band minimum around the $M$ point and valence band maximum around the $\Gamma$ point. More importantly, the anisotropic spin splitting and out-of-plane spin polarization are sensitively affected by surface imperfections, depending on the concentration and configuration of the $X$ and $Y$ elements in the 2D Janus $X{A}_{2}Y$ surface. Our study offer the possibility to realize the present systems for spintronics applications.

arXiv comment5 Figures, accepted in Physical Review Materials

References in corpus (30)

• New Perspectives for Rashba Spin-Orbit Coupling
• Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
• Self-consistent phonon calculations of lattice dynamical properties in cubic SrTiO${}_3$ with first-principles anharmonic force constants
• Manipulation of the large Rashba spin splitting in polar two-dimensional transition metal dichalcogenides
• All-electric all-semiconductor spin field effect transistors
• Giant Spin Relaxation Anisotropy in Zinc-Blende Heterostructures
• Giant tunable Rashba spin splitting in two-dimensional BiSb monolayer and BiSb/AlN heterostructures
• Topological surface state under graphene for two-dimensional spintronics in air
• Rashba and Dresselhaus Spin-Splittings in Semiconductor Quantum Wells Measured by Spin Photocurrents
• High-pressure melt growth and transport properties of SiP, SiAs, GeP, and GeAs 2D layered semiconductors
• Spin relaxation of conduction electrons
• Structural, Vibrational and Electronic Properties of Single Layer Hexagonal Crystals of Groups IV and V
• Higher-order contributions to the Rashba-Bychkov effect with application to Bi/Ag(111) surface alloy
• Synthesis of epitaxial monolayer Janus SPtSe
• Origin of inverse Rashba-Edelstein effect at Cu/Bi interface using lateral spin valves
• Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling
• Intrinsic persistent spin helix in two-dimensional group-IV monochalcogenide MX (M : Sn, Ge; X: S, Se, Te) monolayer
• Electric field-driven coherent spin reorientation of optically generated electron spin packets in InGaAs
• Strong Rashba effect in the localized impurity states of halogen-doped monolayer PtSe2
• Theory of anisotropic Rashba splitting of surface states
• Unveiling Giant Hidden Rashba Effects in Two-Dimensional Si${}_2$Bi${}_2$
• Extrinsic Spin Hall Effect from Anisotropic Rashba Spin-Orbit Coupling in Graphene
• 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
• First-principles study on the stability and electronic structure of monolayer GaSe with trigonal-antiprismatic structure
• Theoretical models of Rashba spin splitting in asymmetric SrTiO3-based heterostructures
• Full-zone Persistent Spin Textures with Giant Spin Splitting in Two-dimensional Group IV-V Compounds
• Electrical tuning of spin splitting in Bi-doped ZnO nanowires
• Reversible canted persistent spin textures with large spin splitting in two-dimensional ferroelectric bilayer WTe${}_2$
• Emergence of Rashba spin valley state in two-dimensional strained bismuth oxychalcogenides Bi${}_2$O${}_2$Se