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Group-V elemental monolayers including phosphorene are emerging as promising2D materials with semiconducting electronic properties. Here, we present theresults of first principles calculations on stability, mechanical andelectronic properties of 2D antimony (Sb), antimonene. Our calculations showthat free-standing {\alpha} and \b{eta} allotropes of antimonene are stable andsemiconducting. The {\alpha}-Sb has a puckered structure with two atomicsub-layers and \b{eta}-Sb has a buckled hexagonal lattice. The calculated Ramanspectra and STM images have distinct features thus facilitatingcharacterization of both allotropes. The \b{eta}-Sb has nearly isotropicmechanical properties while {\alpha}-Sb shows strongly anisotropiccharacteristics. An indirect-direct band gap transition is expected withmoderate tensile strains applied to the monolayers, which opens up thepossibility of their applications in optoelectronics.

Atomically thin group-V elemental films: theoretical investigations of antimonene allotropes