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Intra- and inter-shell Kondo effects in carbon nanotube quantum dots

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  • Damian Krychowski

    (Institute of Molecular Physics Polish Academy of Sciences)

  • Stanisław Lipiński

    (Institute of Molecular Physics Polish Academy of Sciences)

Abstract

The linear response transport properties of carbon nanotube quantum dot in the strongly correlated regime are discussed. The finite-U mean field slave boson approach is used to study many-body effects. Magnetic field can rebuilt Kondo correlations, which are destroyed by the effect of spin-orbit interaction or valley mixing. Apart from the field induced revivals of SU(2) Kondo effects of different types: spin, valley or spin-valley, also more exotic phenomena appear, such as SU(3) Kondo effect. Threefold degeneracy occurs due to the effective intervalley exchange induced by short-range part of Coulomb interaction or due to the intershell mixing. In narrow gap nanotubes the full spin-orbital degeneracy might be recovered in the absence of magnetic field opening the condition for a formation of SU(4) Kondo resonance.

Suggested Citation

  • Damian Krychowski & Stanisław Lipiński, 2018. "Intra- and inter-shell Kondo effects in carbon nanotube quantum dots," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 91(1), pages 1-20, January.
    • Handle: RePEc:spr:eurphb:v:91:y:2018:i:1:d:10.1140_epjb_e2017-80547-y
    DOI: 10.1140/epjb/e2017-80547-y
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    Mesoscopic and Nanoscale Systems;

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