The interplay of Rashba and quantum spin Hall effects in non-centrosymmetric systems presents both challenges and opportunities for spintronic applications. While Rashba spin-orbit coupling can disrupt the quantum spin Hall phase, their coexistence may enable additional spintronic functionalities by coupling spin-momentum locking in the bulk with topologically protected edge states. Using the ${\mathrm{ZnIn}}_2{\mathrm{Te}}_4$ monolayer, a predicted polar two-dimensional topological insulator, as a case study, we investigate how intrinsic and Rashba spin-orbit coupling compete within a single material. Our results identify key conditions under which sizable Rashba spin splitting can coexist with a stable quantum spin Hall phase, offering guidance for engineering quantum spin Hall insulators with enhanced spintronic capabilities.

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• Electric polarization
• Electronic structure
• Topological materials
• First-principles calculations
• Tight-binding model