Spin-Polarized Transport Through a Quantum Dot Coupled to Ferromagnetic Leads:Kondo Correlation Effect |
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Authors: | MA Jing DONG Bing LEI Xiao-Lin |
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Institution: | Department of Physics, Shanghai Jiao Tong University, Shanghai 200030, China |
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Abstract: | We investigate the linear and nonlinear transport through a single level
quantum dot connected to two ferromagnetic leads in Kondo regime, using the slave-boson
mean-field approach for finite on-site Coulomb repulsion. We find that
for antiparallel alignment of the spin orientations in the leads, a
single zero-bias Kondo peak always appears in the voltage-dependent differential conductance with peak height going down to zero as the polarization grows to P=1.
For parallel configuration, with increasing polarization from zero,
the Kondo peak descends and greatly widens with the appearance of shoulders,
and finally splits into two peaks on both sides of the bias voltage
around P~0.7 until disappearing at
even larger polarization strength. At any spin orientation angle θ,
the linear conductance generally drops with growing polarization strength.
For a given finite polarization, the minimum linear conductance always
appears at θ=π. |
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Keywords: | quantum dot Kondo correlation effect transport |
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