https://doi.org/10.1140/epjb/e2017-80547-y
Regular Article
Intra- and inter-shell Kondo effects in carbon nanotube quantum dots
Institute of Molecular Physics Polish Academy of Sciences,
M. Smoluchowskiego 17,
60-179
Poznań, Poland
a e-mail: lipinski@ifmpan.poznan.pl
Received:
28
September
2017
Published online: 15
January
2018
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.
Key words: Mesoscopic and Nanoscale Systems
© The Author(s) 2018. This article is published with open access at Springerlink.com
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
