Two-orbital Kondo effect in a quantum dot coupled to ferromagnetic leads
نویسندگان
چکیده
منابع مشابه
Kondo effect in a quantum dot coupled to ferromagnetic leads: a numerical renormalization group analysis.
We investigate the effects of spin-polarized leads on the Kondo physics of a quantum dot using the numerical renormalization group method. Our study demonstrates in an unambiguous way that the Kondo effect is not necessarily suppressed by the lead polarization: While the Kondo effect is quenched for the asymmetric Anderson model, it survives even for finite polarizations in the regime where cha...
متن کاملKondo effect in quantum dots coupled to ferromagnetic leads.
We study the Kondo effect in a quantum dot coupled to ferromagnetic leads and analyze its properties as a function of the spin polarization of the leads. Based on a scaling approach, we predict that for parallel alignment of the magnetizations in the leads the strong-coupling limit of the Kondo effect is reached at a finite value of the magnetic field. Using an equation of motion technique, we ...
متن کاملKondo quantum dot coupled to ferromagnetic leads: Numerical renormalization group study
M. Sindel,1 L. Borda,1,2 J. Martinek,3,4,5 R. Bulla,6 J. König,7 G. Schön,5 S. Maekawa,3 and J. von Delft1 1Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität München, 80333 München, Germany 2Research Group “Theory of Condensed Matter” of the Hungarian Academy of Sciences, TU Budapest, Budapest H-1521, Hungary 3Instit...
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We investigate the effects induced by ferromagnetic contacts attached to a serial double quantum dot. Spin polarization generates effective magnetic fields and suppresses the Kondo effect in each dot. The superexchange interaction J(AFM), tuned by the interdot tunneling rate t, can be used to compensate the effective fields and restore the Kondo resonance when the contact polarizations are alig...
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We investigate theoretically the linear conductance of a two-level quantum dot as a function of the gate voltage and different strength of coupling to the external electronic system (the reservoir). Apart from the weak coupling regime, characterized by the Kondo-enhancement of the conductance in the spin-ful ground state, a strong coupling regime, which can be called mixed-valence (MV), is foun...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2011
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.83.155310