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With first principles calculations, we predict a novel stable 2D layeredstructure for group VI elements Se and Te that we call square selenene andsquare tellurene, respectively. They have chair-like buckled structures similarto other layered materials such as silicene and germanene but with a squareunit cell rather than hexagonal. This special structure gives rise toanisotropic band dispersions near the Fermi level that can be described by ageneralized semi-Dirac Hamiltonian. We show that the considerably large bandgap ($\sim$0.1 eV) opened by spin-orbit coupling makes square selenene andtellurene topological insulators, hosting non-trivial edge states. Therefore,square selenene and tellurene are promising materials for novel electronic andspintronic applications. Finally, we show that this new type of 2D elementalmaterial can potentially be grown on proper substrates, such as a Au(100)surface.

Square selenene and tellurene: novel group VI elemental 2D semi-Dirac materials and topological insulators