Phonon-assisted Kondo effect in single-molecule quantum dots coupled to ferromagnetic leads |
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Authors: | Hui Yu Ting-Dun Wen Q.F. Sun |
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Affiliation: | a Department of Physics, North University of China, Taiyuan, Shanxi 030051, China b Institute of Theoretical Physics, Shanxi University, Taiyuan, Shanxi 030051, China c Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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Abstract: | Based on the infinite-U Anderson model spin-polarized transport through the tunnel magnetoresistance (TMR) system of single-molecule quantum dot is investigated under the interplay of strong electron correlation and electron-phonon (e-ph) coupling. The spectral density and the nonlinear differential conductance are studied using the extended non-equilibrium Green's function method through calculating the dot-level splitting self-consistently. The results exhibit that a serial of peaks emerge on the two sides of the main Kondo peak for the antiparallel magnetic configuration of electrodes, while for the parallel case both the main and phonon-assisted satellite Kondo peaks all split up into two asymmetric peaks even at zero-bias. Correspondingly, the nonlinear differential conductance displays a set of satellite-peaks around the Kondo-peak in the presence of the e-ph interaction. Furthermore, extra maxima and minima appear in the TMR curve. The TMR alternates between the positive and the negative values along with the variation of bias voltage. |
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Keywords: | 71.38.-k 72.15.Qm 73.63.-b 72.25.-b |
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