Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-04-04
Phys. Rev. B 85, 155314 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 9 figures
Scientific paper
10.1103/PhysRevB.85.155314
We study the Kondo effect in side-coupled double quantum dots with particular focus on the crossover between two distinct singlet ground states, using the numerical renormalization group. The crossover occurs as the quantized energy level of the embedded dot, which is connected directly to the leads, is varied. In the parameter region where the embedded dot becomes almost empty or doubly occupied, the local moment emerging in the other dot at the side of the path for the current is screened via a superexchange process by the conduction electrons tunneling through the embedded dot. In contrast, in the other region where the embedded dot is occupied by a single electron, the local moment emerges also in the embedded dot, and forms a singlet bond with the moment in the side dot. Furthermore, we derive two different Kondo Hamiltonians for these limits carrying out the Schrieffer-Wolff transformation, and show that they describe the essential feature of the screening for each case.
Kawakami Norio
Oguri Akira
Tanaka Yoichi
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