Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-24
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 7 figures
Scientific paper
10.1103/PhysRevB.77.035120
We study numerically and analytically the dynamical (AC) conductance through a two-dot system, where only one of the dots is coupled to the leads but it is also side-coupled to the other dot through an antiferromagnetic exchange (RKKY) interaction. In this case the RKKY interaction gives rise to a ``two-stage Kondo effect'' where the two spins are screened by two consecutive Kondo effects. We formulate a renormalized scaling theory that captures remarkably well the cross-over from the strongly conductive correlated regime to the low temperature low conductance state. Our analytical formulas agree well with our numerical renormalization group results. The frequency dependent current noise spectrum is also discussed.
Chung Chung-Hou
Wölfle Peter
Zarand Gergely
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