Quantum transmission through the n-p-n heterojunction of massive 8-borophene.

We investigate the quantum transmission through the n-p-n heterojunction of massive 8-borophene. It is found that the Dirac mass of the electron interacts nontrivially with the anisotropy of the 8-borophene, leading to the occurrence of new transmission behaviors in this n-p-n heterojunction. Firstly, the effective energy range of nonzero transmission can be reduced but deviates from the mass amplitude, which induces the further controllability of the transmission property. Secondly, even if the equal-energy surfaces in the p and n parts do not encounter in the-space, finite transmission is allowed to occur as well. In addition, the existence of Dirac mass can change the reflection manner from the retroreflection to the specular reflection under appropriate conditions. The findings in this work can be helpful in describing the quantum transport properties of the heterojunction based on 8-borophene.