Group 14 element-based non-centrosymmetric quantum spin Hall insulators with large bulk gap

To date, a number of two-dimensional （2D） topological insulators （TIs） have been realized in Group 14 elemental honeycomb lattices, but all are inversionsymmetric. Here, based on first-principles calculations, we predict a new family of 2D inversion-asymmetric TIs with sizeable bulk gaps from 105 me...

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