Mechanical Properties and Superconductivity in Two-Dimensional B2O under Extreme Strain
A B2O monolayer was theoretically identified with a cleavage energy of 26 meV/Å2, similar to those of graphene and phosphorene. Its mechanical and electronic properties were systematically investigated at large strain using first-principles calculations. A negative Poisson’s ratio appeared in the monolayer at the critical tensile strain point. The B2O monolayer was calculated to be a superconductor, with strain making its superconducting state more robust. These results elucidate the structural and corresponding physical properties of this monolayer, and may stimulate related fundamental research and potential nanoscale applications.