Singlet-triplet transition in lateral quantum dots: A numerical renormalization group study

W. Hofstetter, G. Zarand

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We discuss transport through a lateral quantum dot in the vicinity of a singlet-triplet spin transition in its ground state. Extracting the scattering phase shifts from the numerical renormalization group spectra, we determine the linear conductance at zero temperature as a function of a Zeeman field and the splitting of the singlet and triplet states. We find reduced low-energy transport, and a nonmonotonic magnetic-field dependence both in the singlet and the triplet regime. For a generic set of dot parameters and no Zeeman splitting, the singlet-triplet transition may be identified with the conductance maximum. The conductance is least sensitive to the magnetic field in the region of the transition, where it decreases upon application of a magnetic field. Our results are in good agreement with recent experimental data.

Original languageEnglish
Article number235301
Pages (from-to)235301-1-235301-9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number23
DOIs
Publication statusPublished - Jun 1 2004

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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