Vibrational distortion effects in transport through single molecular magnets

摘要

We study the transport through an isotropic single molecular magnet (S=1) with electron-vibron coupling using Keldysh's non-equilibrium Green function based on Hubbard operator. Electron-vibron coupling smooths the current steps due to the broadening of effective channel levels and shifts the elastic resonance peaks in differential conductance down in energy. At low temperature vibron-assisted peaks appear only at energies above the elastic resonance due to the absence of vibron excitation. The electron-vibron coupling also leads to the increase of shot noise, which gets more evident with increasing electron-vibron coupling.