Novel auxetic semiconductors with high carrier mobility: first principles prediction of Janus GeXY (X/Y = S, Se, Te) monolayers.

Recently, auxetic materials have attracted attention due to their unusual behavior and multifunctional applications. A negative Poisson's ratio has been found in some two-dimensional (2D) asymmetric layered materials. In this work, we predict a new class of 2D auxetic materials with the chemical formula GeXY (X/Y = S, Se, Te) using calculations.