2006/09/30 by P. G. Silvestrov, Y. Imry · 2 citations
Engineering · Physics and Astronomy · #Magnetic properties of thin films #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.75.115335
published as Phys. Rev. B 75, 115335 (2007) · 6 pages, 2 figures
openalex publication_date 2007/03/30 · arxiv created 2007/04/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 T⪢TK, 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=e2∕h for some finite value of the level splitting \ensuremathΔ\ensuremathε\ensuremath∼TK. 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.