Physics – Condensed Matter
Scientific paper
1993-09-27
Physics
Condensed Matter
33 pages (and 10 figures, available by request to wingreen@research.nj.nec.com), Latex
Scientific paper
10.1103/PhysRevB.49.11040
The infinite-U Anderson model is applied to transport through a quantum dot. The current and density of states are obtained via the non-crossing approximation for two spin-degenerate levels weakly coupled to two leads. At low temperatures, the Kondo peak in the equilibrium density of states strongly enhances the linear-response conductance. Application of a finite voltage bias reduces the conductance and splits the peak in the density of states. The split peaks, one at each chemical potential, are suppressed in amplitude by a finite dissipative lifetime. We estimate this lifetime perturbatively as the time to transfer an electron from the higher chemical potential lead to the lower chemical potential one. At zero magnetic field, the clearest signatures of the Kondo effect in transport through a quantum dot are the broadening, shift, and enhancement of the linear-response conductance peaks at low temperatures, and a peak in the nonlinear differential conductance around zero bias.
Meir Yigal
Wingreen Ned S.
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