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

Damian Krychowski and Stanisław Lipiński ()
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Damian Krychowski: Institute of Molecular Physics Polish Academy of Sciences
Stanisław Lipiński: Institute of Molecular Physics Polish Academy of Sciences

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 1, 1-20

Abstract: 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.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2017-80547-y

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