Kondo effect in electron tunneling through quantum dots - Study with Quantum Monte Carlo method

Osamu Sakai, Shunya Suzuki, Wataru Izumida, Akira Oguri

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Based on the Quantum Monte Carlo (QMC) technique, we developed a method to calculate the tunneling conductance of the quantum dot systems for which the Kondo effect becomes important. The method computes the conductance directly from the current correlation function, and is applicable to the cases in which the calculation is not reduced to the computation of single particle Green's function. We compare the calculated conductance with experiments, and found good qualitative agreement. The temperature in experiments seems to be not low enough compared with the Kondo temperature in the mid region of the two paired Coulomb oscillation peaks. We studied the Zeeman field effect, and showed that the conductance is strongly suppressed when it has been enhanced by the Kondo effect. The conductance of an Aharonov-Bhom circuit including dots was also studied.

Original languageEnglish
Pages (from-to)1640-1650
Number of pages11
Journaljournal of the physical society of japan
Volume68
Issue number5
DOIs
Publication statusPublished - 1999 May

Keywords

  • Aharonov-Bhom effect
  • Kondo effect
  • Numerical renormalization group method
  • Quantum Monte Carlo method
  • Quantum dot
  • Tunneling

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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