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Two-dimensional materials provide remarkable platforms to uncover intriguingquantum phenomena and develop nanoscale devices of versatile applications.Recently, AlSb in the double-layer honeycomb (DLHC) structure was successfullysynthesized exhibiting a semiconducting nature [ACS Nano 15, 8184 (2021)],which corroborates the preceding theoretical predictions and stimulates theexploration of new robust DLHC materials. In this work, we propose a Janus DLHCmonolayer Al$_2$SbBi, the dynamical, thermal, and mechanical stabilities ofwhich are confirmed by first-principles calculations. Monolayer Al$_2$SbBi isfound to be a nontrivial topological insulator with a gap of about 0.2 eV,which presents large spin splitting and peculiar spin texture in the valencebands. Furthermore, due to the absence of inversion symmetry, monolayerAl$_2$SbBi exhibits piezoelectricity and the piezoelectric strain coefficientsd$_{11}$ and d$_{31}$ are calculated to be 7.97 pm/V and 0.33 pm/V,respectively, which are comparable to and even larger than those of manypiezoelectric materials. Our study suggests that monolayer Al$_2$SbBi haspotential applications in spintronic and piezoelectric devices.

Large spin splitting and piezoelectricity in a two-dimensional topological insulator Al$_2$SbBi with double-layer honeycomb structure