標題: Two-stage Kondo effect in side-coupled quantum dots: Renormalized perturbative scaling theory and numerical renormalization group analysis
作者: Chung, Chung-Hou
Zarand, Gergely
Woelfle, Peter
電子物理學系
Department of Electrophysics
公開日期: 1-Jan-2008
摘要: 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 Ruderman-Kittel-Kasuya-Yoshida (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 crossover 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.
URI: http://dx.doi.org/10.1103/PhysRevB.77.035120
http://hdl.handle.net/11536/9797
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.77.035120
期刊: PHYSICAL REVIEW B
Volume: 77
Issue: 3
起始頁: 0
結束頁: 0
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