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Journal of Superconductivity and Novel Magnetism

, Volume 28, Issue 8, pp 2553–2559 | Cite as

Ground State Properties and Electron Transport in Parallel Double Quantum Dot System with Charge Number N tot ≤ 2

  • Yong-Chen Xiong
  • Shi-Jun Luo
  • Hai-Ming Huang
  • Jun-Tao Yang
Original Paper

Abstract

We study the ground state properties and the electron transport in a double quantum dot system with the numerical renormalization group method for a wide range of the charge energy 𝜖. When 𝜖 is chosen in the Kondo regime, we find a quantum phase transition of first order between local spin triplet and singlet with increasing interdot hopping t. For small t, the Kondo resonance is observed, while for large t, it is strongly suppressed. When 𝜖 is in the mixed-valence regime, the system transits from a magnetic frustration phase to the singlet continuously, and the potential scattering peak is suppressed. For 𝜖 in the frozen impurity regime, the system transits to the spin singlet through a crossover, and the linear conductance is merely determined by the charge density of the bonding state. Our results is consistent with the perturbation theory.

Keywords

Double quantum dot Electron transport Quantum phase transition Numerical renormalization group 

Notes

Acknowledgments

This work is supported by National Natural Science Foundation of China under Grant No. 10874132 and No. 11174228, and the Doctoral Scientific Research Foundation of HUAT under Grant No. BK201407.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Yong-Chen Xiong
    • 1
  • Shi-Jun Luo
    • 1
  • Hai-Ming Huang
    • 1
  • Jun-Tao Yang
    • 1
  1. 1.School of ScienceHubei University of Automotive TechnologyHubeiPeople’s Republic of China

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