Two-stage Kondo effect in side-coupled quantum dots: Renormalized perturbative scaling theory and numerical renormalization group analysis

Chung-Hou Chung, Gergely Zarand, and Peter Wölfle
Phys. Rev. B 77, 035120 – Published 17 January 2008

Abstract

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.

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  • Received 26 July 2007

DOI:https://doi.org/10.1103/PhysRevB.77.035120

©2008 American Physical Society

Authors & Affiliations

Chung-Hou Chung1,3, Gergely Zarand1,2, and Peter Wölfle1,4

  • 1Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany
  • 2Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, H1111, Budapest, Hungary
  • 3Electrophysics Department, National Chiao-Tung University, 300, HsinChu, Taiwan, Republic of China
  • 4Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76026 Karlsruhe, Germany

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Issue

Vol. 77, Iss. 3 — 15 January 2008

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