Theoretical Study on Spin Polarization of III-V Compound Tips

摘要

We investigate spin electronic structure of GaNprobes, using first principles molecular orbital calculations. It isfound that at the pyramidal heads of the probes with the axesparallel to the crystallographic axes [100] and [111] in thezincblende GaN, electron spins are polarized at the lowest energystates. Nearly 8%~16% of electrons in the valence band are spin-polarized at the proximity of the head depending upon the sort ofthe atom on the apex and the crystallographic axis of the probe. Itis observed that spin polarizability depends on the difference ofelectronegativities of the elements in a compound and on a highlysymmetric nanostructure of the probe. It is due to Jahn-Tellereffect of the tip configuration.