21,843 research outputs found
Model Calculation of Effective Three-Body Forces
We propose a scheme for extracting an effective three-body interaction
originating from a two-nucleon interaction. This is based on the Q-box method
of Kuo and collaborators, where folded diagrams are obtained by differentiating
a sum of non-folded diagrams with respect to the starting energy. To gain
insight we have studied several examples using the Lipkin model where the
perturbative approach can be compared with exact results. Numerically the
three-body interactions can be significant and in a matrix example good
accuracy was not obtained simultaneously for both eigenvalues with two-body
interactions alone.Comment: 9 pages, Revtex4, 7 figs, submitted to PR
Interdot Coulomb repulsion effect on the charge transport of parallel double single electron transistors
The charge transport behaviors of parallel double single electron transistors
(SETs) are investigated by the Anderson model with two impurity levels. The
nonequilibrium Keldysh Green's technique is used to calculate the
current-voltage characteristics of system. For SETs implemented by quantum dots
(QDs) embedded into a thin layer, the interdot Coulomb repulsion is
more important than the interdot electron hopping as a result of high potential
barrier height between QDs and . We found that the interdot Coulomb
repulsion not onlyleads to new resonant levels, but also creates negative
differential conductances.Comment: 12 pages, 7 figure
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