Many Body Effects on Electron Tunneling through Quantum Dots in an Aharonov-Bohm Circuit

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Abstract

Tunneling conductance of an Aharonov-Bohm circuit including two quantum dots is calculated based on the general expression of the conductance in the linear response regime of the bias voltage. The calculation is performed in a wide temperature range by using numerical renormalization group method. Various types of AB oscillations appear depending on the temperature and the potential depth of the dots. Especially, AB oscillations have strong higher harmonics components as a function of the magnetic flux when the potential of the dots is deep. This is related to the crossover of the spin state due to the Kondo effect on quantum dots. When the temperature rises up, the amplitude of the AB oscillations becomes smaller reflecting the breaking of the coherency.

Original languageEnglish
Pages (from-to)717-726
Number of pages10
Journaljournal of the physical society of japan
Volume66
Issue number3
DOIs
Publication statusPublished - 1997 Mar

Keywords

  • Aharonov-Bohm effect
  • Kondo effect
  • Numerical renormalization group method
  • Quantum dots

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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