Conductance through quantum dot dimer below the Kondo temperature

Tomosuke Aono, Mikio Eto, Kiyoshi Kawamura

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The conductance through two quantum dots connected in series is studied below the Kondo temperature, based on the slave boson formalism of the Anderson model. The transport properties are characterized by the ratio of the magnitude of the tunneling coupling between two dots to the width of the level broadening. When the ratio is less than unity, the Kondo resonant states are formed between each dot and an external lead, and the conductance is determined by the hopping between the two resonant states. When the ratio is larger than unity, these Kondo resonances are split into the bonding and antibonding peaks, which are located below and above the Fermi level in the leads, respectively, for low gate voltages. As a result, the conductance is suppressed. The conductance has a maximum of 2e2/h when the bonding peak is matched with the Fermi level by controlling the gate voltage.

Original languageEnglish
Pages (from-to)1860-1863
Number of pages4
JournalJournal of the Physical Society of Japan
Volume67
Issue number6
DOIs
Publication statusPublished - 1998 Jun

Keywords

  • Coupled quantum dots
  • Degenerate Anderson model
  • Kondo effect
  • Quantum dot
  • Slave boson formalism

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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