Hall effect (SHE) and the Rashba-Edelstein effect (REE), [1,2] or vice versa. Emergent topological quantum materials, including topological insulators (TIs), [3-6] Dirac semimetals, [7] and Weyl metals [8-11]-as the key core of quantum material familieshave been compelling due to their order of magnitudes larger charge-to-spin conversion efficiencies compared to those in heavy metals. [12,13] While the spin-to-charge (SCC) efficiencies of most 3D TIs with a single surface state remain moderate, [14,15] the convergence of multiple nontrivial topological phases in one material, such as dual topological insulators, may suggest a new route for designing TI-based quantum materials. [16] Protected by both mirror symmetry and time reversal invariant symmetry, dual TIs would exhibit a high SCC efficiency benefiting from synergistic contributions of the coexisting TI phases. One prototypical example is (Bi 2-Bi 2 Se 3) N topological superlattices (N is the repeating unit number), categorized as one of an infinitely adaptive TI family series consisting of alternating one bismuth bilayer (Bi BL) and one quintuple bismuth selenide layer (Bi 2 Se 3 QL). [17] In