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The discovery of quantum spin Hall effect has ignited the field oftopological physics with vast variety of exotic properties. Here, we presentthe emergence of doubled quantum spin Hall effect in two dimensionscharacterized with a high spin Chern number of ${\mathcal C_S}=2$ and two pairsof helical edge states. Although is overlooked and invisible in topologicalquantum chemistry and symmetry indicator theory, the already experimentallysynthesized $\alpha$-antimonene and $\alpha$-bismuthene are revealed asrealistic material candidates of predicted topological states with bandinversions emerging at generic $k$-points, rather than the high-symmetrymomenta. Remarkably, the nontrivial energy gap can be as large as 464 meV for$\alpha$-bismuthene, indicating the high possibility of room-temperatureobservation of the doubled quantum spin Hall effect. Moreover, a four-bandeffective model is constructed to demonstrate further the feasibility ofattaining this type of nontrivial topology. Our results not only uncover anovel topological character of antimony and bismuth, but will also facilitatethe experimental characterization of the previously overlooked hidden topology.

Doubled Quantum Spin Hall Effect with High-Spin Chern Number in $\alpha$-Antimonene and $\alpha$-Bismuthene