Prediction of the ferroelastic and negative Poisson’s ratio of a two-dimensional α-CaX (X = S, Se) monolayer

Two-dimensional ferroelastic semiconductor materials have attracted wide attention due to their unique properties. Along these lines, in this work, a series of new types of two-dimensional materials called monolayer α -Ca X ( X  = S, Se) were proposed and thoroughly investigated by performing first-...

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