Kondo Effect in Single Quantum Dot Systems - Study with Numerical Renormalization Group Method

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The tunneling conductance is calculated as a function of the gate voltage in wide temperature range for the single quantum dot systems with Coulomb interaction. We assume that two orbitals are active for the tunneling process. We show that the Kondo temperature for each orbital channel can be largely different. The tunneling through the Kondo resonance almost fully develops in the region T ≲ 0.1TK*, ∼ 0.2TK*, where TK* is the lowest Kondo temperature when the gate voltage is varied. At high temperatures the conductance changes to the usual Coulomb oscillations type. In the intermediate temperature region, the degree of the coherency of each orbital channel is different, so strange behaviors of the conductance can appear. For example, the conductance once increases and then decreases with temperature decreasing when it is suppressed at T = 0 by the interference cancellation between different channels. The interaction effects in the quantum dot systems lead the sensitivities of the conductance to the temperature and to the gate voltage.

Original languageEnglish
Pages (from-to)2444-2454
Number of pages11
JournalJournal of the Physical Society of Japan
Issue number7
Publication statusPublished - 1998 Jul


  • Coulomb oscillations
  • Kondo effect
  • Quantum dot
  • Tunneling


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