Cotunneling through a quantum dot coupled to ferromagnetic
leads with noncollinear magnetizations |
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Authors: | I?Weymann Email author" target="_blank">J?Barna?Email author |
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Institution: | (1) Department of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland;(2) Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Poland |
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Abstract: | Spin-dependent electronic transport through a quantum
dot has been analyzed theoretically in the cotunneling regime by
means of the second-order perturbation theory. The system is
described by the impurity Anderson Hamiltonian with arbitrary
Coulomb correlation parameter U. It is assumed that the dot
level is intrinsically spin-split due to an effective molecular
field exerted by a magnetic substrate. The dot is coupled to two
ferromagnetic leads whose magnetic moments are noncollinear. The
angular dependence of electric current, tunnel magnetoresistance,
and differential conductance are presented and discussed. The
evolution of a cotunneling gap with the angle between magnetic
moments and with the splitting of the dot level is also
demonstrated. |
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Keywords: | |
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