Phonon-assisted Kondo effect in single-molecule quantum dots coupled to ferromagnetic leads

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 differentia...

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Bibliographic Details
Published in:Physics letters. A 2008-11, Vol.372 (46), p.6944-6951
Main Authors: Yu, Hui, Wen, Ting-Dun, Liang, J.-Q., Sun, Q.F.
Format: Article
Language:English
Subjects:
Kondo effects
Phonon-assisted
Spin-polarized transport
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Summary: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.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2008.10.006