Two-impurity kondo effect in double-quantum-dot systems: Effect of interdot kinetic exchange coupling

Wataru Izumida, Osamu Sakai

研究成果: Article査読

112 被引用数 (Scopus)

抄録

Tunneling conductance through two quantum dots, which are connected in series to left and fight leads, is calculated by using the numerical renormalization group method. As the hopping between the dots increases from a very small value, the following states continuously appear: (i) Kondo singlet state of each dot with its adjacent-site lead, (ii) singlet state between the local spins on the dots, and (iii) double occupancy in the bonding orbital of the two dots. The conductance shows peaks at the crossover regions between these states. The peak at the boundary between (i) and (ii) especially has the unitarity limit value of 2e2/h because of coherent connection through the lead-dot-dot-lead. For the strongly correlated cases, the characteristic energy scale of the coherent peak shows anomalous decrease relating to the quantum critical transition known for the two-impurity Kondo effect. The two dot systems give a new realization of the two-impurity Kondo problem.

本文言語English
ページ(範囲)10260-10267
ページ数8
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
62
15
DOI
出版ステータスPublished - 2000 10 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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