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Motivated by recent observation of the quantum spin Hall effect in monolayergermanene and twisted bilayer transition-metal-dichalcogenides (TMDs), we studythe topological phases of moir\'e twisted bilayers with time-reversal symmetryand spin $s_z$ conservation. By using a continuum model description which canbe applied to both germanene and TMD bilayers, we show that at small twistangles, the emergent moir\'e flatbands can be topologically nontrivial due toinversion symmetry breaking. Each of these flatbands for each spin projectionadmits a lowest-Landau-level description in the chiral limit and at magic twistangle. This allows for the construction of a many-body Laughlin state withtime-reversal symmetry which can be stabilized by a short-rangepseudopotential, and therefore serves as an ideal platform for realizing theso-far elusive fractional quantum spin Hall effect with emergent spin-1/2 U(1)symmetry.

Time-Reversal Invariant Topological Moir\'e Flatband: A Platform for the Fractional Quantum Spin Hall Effect