The role of spin-exchange on transport in quantum dots

Yi Wan, Philip Phillips, Qiming Li

Research output: Contribution to journalArticlepeer-review


We analyze here a model for single-electron charging in semiconductor quantum dots that includes the standard Anderson on-site repulsion (U) as well as the spin-exchange (Jd) that is inherently present among the electrons occupying the various quantum levels of the dot. A Schrieffer-Wolff-type transformation is developed to analyze this model. We show explicitly that for ferromagnetic coupling (Jd > 0), an s-d exchange for an S = 1 Kondo problem is recovered. In contrast, for the antiferromagnetic case, Jd > 0, we find that the Kondo effect is present only if there are an odd number of electrons on the dot. Spin-exchange is then shown to produce a second period in the conductance that is consistent with experimental measurements.

Original languageEnglish (US)
Pages (from-to)280-285
Number of pages6
JournalPhysica D: Nonlinear Phenomena
Issue number1-3
StatePublished - May 15 1995

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Applied Mathematics


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