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Minimal realization of the Orbital Kondo effect: a Quantum Dot with two Leads | | P.G.Silvestrov
; Y.Imry
; | | Date: |
14 Sep 2006 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | | Abstract: | We demonstrate theoretically how the Kondo effect may be observed in the transport of spinless electrons through a quantum dot. The role of conduction electron spin is played by a lead index. The Kondo effect takes place if there are two close levels in the dot populated by a single electron. For temperatures exceeding the Kondo temperature $Tgg T_K$ the conductance is maximal if the levels are exactly degenerate. However, at zero temperature the conductance is zero at the $SU(2)$ symmetric point, but reaches the unitary limit $G = e^2/h$ for some finite value of the level splitting $Deltaepssim T_K$. Introducing the spin-$1/2$ for electrons and having two degenerate orbital levels in the dot allows to observe the $SU(4)$ Kondo effect in a single dot coupled to two leads. | | Source: | arXiv, cond-mat/0609355 | | Services: | Forum | Review | PDF | Favorites | |
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