The Kondo effect in a one- and two-electron quantum dot

Satoshi Sasaki, Yoshitaka Kitamura, Wataru Izumida, Keiji Ono, Seigo Tarucha

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1 Citation (Scopus)


We study the Kondo effect in a vertical quantum dot holding only one- or two-electrons. We observe clear Kondo features in the temperature and bias voltage dependence of the conductance when there is only one electron in the dot (spin S = 1/2). The estimated Kondo temperature is much higher than in previous reports due to large dot-lead tunnel coupling on the order of 800 μeV. We also observe a Kondo enhancement of the conductance when the two-electron ground state makes a transition from a spin singlet (S = 0) to a triplet (S = 1) at a magnetic field of 3.2 T. The bias voltage dependence of the differential conductance at this transition field shows weak features that may be related to the Zeeman splitting of the triplet state.

Original languageEnglish
Pages (from-to)806-809
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-4
Publication statusPublished - 2002 Jan
Event14th International Conference on the - Prague, Czech Republic
Duration: 2001 Jul 302001 Aug 3


  • Kondo effect
  • Quantum dot
  • Zeeman splitting


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