Macroscopic quantum coherence in a single molecular magnet and Kondo effect of electron transport

We report a Kondo-effect study of electron transport through a quantum dot with embedded biaxial single-molecule magnet based on slave boson mean-field theory and non-equilibrium Green-function technique. It is found the macroscopic quantum coherence of molecule-magnet results in the Kondo peak split of differential conductance due to interaction between electron and molecular magnet. It is also demonstrated that both the peak height and position can be controlled by the sweeping magnetic field and polarization of ferromagnetic electrodes. The characteristic peak split may be used to identify the macroscopic quantum coherence and develop molecule devices.

► Splits of Kondo peak are induced by the single molecular magnet.
► Kondo effect can be controlled by magnetic field and its sweeping speed in our model.
► The suppression and broadening of Kondo peaks is also observed with increase of temperature.
► The peaks height and position is sensitive to polarization of the electrode.