Strain engineering has been proven as an effective approach to modify electronic and thermal properties of materials. Recently, strain effects on two-dimensional materials have become important relevant topics in this field. We performed density functional theory studies on the electronic and heat transport properties of bilayer boronitrene samples under an isotropic strain. We demonstrate that the strain will reduce the band gap width but keep the band gap type robust and direct. The strain will enhance the thermal conductivity of the system because of the increase in specific heat. The thermal conductivity was studied as a function of the phonon mean-free path.

In conclusion, we investigated theoretically the effects of tensile strain on the electronic band structures and the heat transport properties of AB-stacked bilayer boronitrene. We found that when a strain as high as 10% is imposed, the magnitude of the band gap shrinks to 3.73eV. The lattice thermal conductivity will increase with an increase in tensile strain and obeys an inverse dependence on the temperature.