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Electronic transport through a quantum dot with a magnetic impurity using the equation of motion | | Mugurel Tolea
; Bogdan R. Bulka
; | | Rating: | Visitors: 5/5 (1 visitor) | | Date: |
2 Jun 2006 | | Subject: | Materials Science; Mesoscopic Systems and Quantum Hall Effect | | Abstract: | We study the electronic transport through a quantum dot containing a magnetic impurity, using the equation of motion approach. For temperatures above the Kondo temperature, an analytical solution can be obtained for the conductance, occupancy and the spin-spin correlator. The spins are weakly correlated when both singlet and triplet levels are below the Fermi energy, allowing for developing of the Kondo effect in a low temperature. The height of the conductance peaks corresponding to the singlet and triplet states depends on the ratio $J/Gamma$ (an exchange parameter versus a coupling strength with the leads), fundamentally different from the two-electrons spin-scattering picture. We also compute the phase evolution for the single-electron Green function and find that it has a specific dip at the excited state position. For low temperatures, we demonstrate the formation of three Kondo peaks: one at the Fermi energy and two side peaks, at a distance corresponding to the singlet-triplet level spacing. An analytical formula is found that associates the existence of the central peak (the only one important for large exchange parameter) with the value of the spin-spin correlator, the Kondo effect being suppressed for strong antiferromagnetic correlations. | | Source: | arXiv, cond-mat/0606057 | | Services: | Forum | Review | PDF | Favorites | |
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