Vibrational distortion effects in transport through single molecular magnets

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.