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Chessboard Magnetoconductance of a Quantum Dot in the Kondo Regime

  • C. Tejedor
  • L. Martin-Moreno
Part of the NATO Science Series book series (NAII, volume 106)

Abstract

Transport through a quantum dot (QD) in the Kondo regime shows alternating regions of high and low conductance when both an external magnetic field and the gate potential controlling the depth of the QD potential are varied. We present a theoretical analysis of this chessboard aspect of the magneto-conductance. An effective Kondo Hamiltonian is obtained by means of a restriction to the Hilbert space supported by just a few low energy states of N and N ± 1 electrons in the QD. We obtain antiferromagnetic exchange couplings depending on tunneling amplitudes and correlation effects. When either the magnetic field or the number of electrons in the QD is varied, the Kondo temperature shows large oscillations due to the successive appearance of ground states having alternately strong and weak correlation effects.

Keywords

Exchange Coupling Spectral Amplitude Antiferromagnetic Coupling Kondo Temperature Gate Potential 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • C. Tejedor
    • 1
  • L. Martin-Moreno
    • 2
  1. 1.Departamento de Física Teórica de la Materia CondensadaUniversidad Autónoma de MadridCantoblancoMadridSpain
  2. 2.Departamento de Física de la Materia CondensadaUniversidad de ZaragozaZaragozaSpain

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