Kondo transport through serially coupled triple quantum dots

Zhao-tan Jiang, Qing-feng Sun, and Yupeng Wang
Phys. Rev. B 72, 045332 – Published 15 July 2005

Abstract

The equilibrium and nonequilibrium Kondo transport properties of the serially coupled triple quantum dots (TQD’s), including one intermediate dot and two peripheral dots, were studied theoretically. As the Kondo resonance is strongly renormalized in a nontrivial manner by the interdot coupling, the zero-bias conductance shows an asymmetrical double-peak pattern, which is significantly different from the single-conductance-peak pattern that appeared in the TQD device in the Coulomb regime. Furthermore, in the finite-bias case, the current versus the bias shows a peak and a relatively large negative differential conductance is observed. In addition, the superposition of the Kondo spin singlet and the usual naked state is also investigated and strong mixture between them is observed even though they belong to different kinds of states.

    • Received 28 December 2004

    DOI:https://doi.org/10.1103/PhysRevB.72.045332

    ©2005 American Physical Society

    Authors & Affiliations

    Zhao-tan Jiang1,*, Qing-feng Sun1, and Yupeng Wang1,2

    • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
    • 2International Center for Quantum Structures, Chinese Academy of Sciences, Beijing 100080, China

    • *Electronic address: ztjiang@aphy.iphy.ac.cn

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    Issue

    Vol. 72, Iss. 4 — 15 July 2005

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