Spin polarization of the injected carriers in C-doped BN nanotubes

We investigated BN nanotubes with two carbon substitutions for one boron atom and one nitrogen atom based on density functional theory (DFT) with local spin density approximation (LSDA). When the two carbon dopants are separated without C–C bond formation, we found that the injected carriers are spin polarized, although there is no net spin in the neutral systems. Here we call the material as ‘spin polarizer’ which can polarize the carriers passing through.