Towards two-channel Kondo effect in triple quantum dot

T. Kyzmenko, K. Kikoin, Y. Avishai

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The effective spin Hamiltonian of a triple quantum dot with odd electron occupation weakly connected in series with left (l) and right (r) metal leads is composed of two-channel exchange and co-tunneling terms. Renormalization group equations for the corresponding three exchange constants Jl, Jr and Jlr are solved (to third order). Since J lr is relevant, the system is mapped on an anisotropic two-channel Kondo problem. The structure of the conductance as a function of temperature and gate voltage implies that in the weak- and intermediate-coupling regimes, two-channel Kondo physics persists at temperatures as low as several T K. At even electron occupation, the number of channels equals twice the spin of the triple dot (hence it is a fully screened impurity).

Original languageEnglish
Pages (from-to)218-224
Number of pages7
Issue number2
StatePublished - 1 Oct 2003

ASJC Scopus subject areas

  • General Physics and Astronomy


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