Kondo tunneling through a biased double quantum dot

Yshai Avishai, Konstantin Kikoin

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Electron tunneling through a system formed by two coupled quantum dots in a parallel geometry is considered within a generalized Anderson model. The dots are assumed to have nearly equal radii but different (and tunable) gate voltages. In the absence of tunneling to and from the leads, the isolated two-dot system (with two electrons in it) resembles an hydrogen molecule within the Heitler London approximation. In particular, it has a singlet ground state and low-lying excited triplet state. When tunneling is switched on, and when the gate voltages are properly tuned the ground state becomes a triplet and singlet and triplet states are intermixed. In the region, where charge fluctuations are suppressed, the pertinent antiferromagnetic exchange interaction has the form (JT S + JST P) · s. It is written in terms of the electron spin s, the double dot spin 1 operator S and an additional vector operator P. The operators S and P generate the algebra o4 of a spin rotator. The related Kondo effect is similar to that of a vertical quantum dot, discussed and analyzed recently.

Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalPhysica A: Statistical Mechanics and its Applications
Issue number1-4
StatePublished - 15 Dec 2001
EventInternational Workshop on Frontiers in the Physics of Complex Systems - Ramat-Gan, Israel
Duration: 25 Mar 200128 Mar 2001

ASJC Scopus subject areas

  • Statistics and Probability
  • Condensed Matter Physics


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