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Kondo effects in small-bandgap carbon nanotube quantum dots
We study the magnetoconductance of small-bandgap carbon nanotube quantum dots in the presence of spin–orbit coupling in the strong-correlations regime. A finite-U slave-boson mean-field approach is used to study many-body effects. Different degeneracies are restored in a magnetic field and Kondo eff...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7770385/ https://www.ncbi.nlm.nih.gov/pubmed/33425637 http://dx.doi.org/10.3762/bjnano.11.169 |
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author | Florków, Patryk Krychowski, Damian Lipiński, Stanisław |
author_facet | Florków, Patryk Krychowski, Damian Lipiński, Stanisław |
author_sort | Florków, Patryk |
collection | PubMed |
description | We study the magnetoconductance of small-bandgap carbon nanotube quantum dots in the presence of spin–orbit coupling in the strong-correlations regime. A finite-U slave-boson mean-field approach is used to study many-body effects. Different degeneracies are restored in a magnetic field and Kondo effects of different symmetries arise, including SU(3) effects of different types. Full spin–orbital degeneracy might be recovered at zero field and, correspondingly, the SU(4) Kondo effect sets in. We point out the possibility of the occurrence of electron–hole Kondo effects in slanting magnetic fields, which we predict to occur in magnetic fields with an orientation close to perpendicular. When the field approaches a transverse orientation a crossover from SU(2) or SU(3) symmetry into SU(4) is observed. |
format | Online Article Text |
id | pubmed-7770385 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
spelling | pubmed-77703852021-01-08 Kondo effects in small-bandgap carbon nanotube quantum dots Florków, Patryk Krychowski, Damian Lipiński, Stanisław Beilstein J Nanotechnol Full Research Paper We study the magnetoconductance of small-bandgap carbon nanotube quantum dots in the presence of spin–orbit coupling in the strong-correlations regime. A finite-U slave-boson mean-field approach is used to study many-body effects. Different degeneracies are restored in a magnetic field and Kondo effects of different symmetries arise, including SU(3) effects of different types. Full spin–orbital degeneracy might be recovered at zero field and, correspondingly, the SU(4) Kondo effect sets in. We point out the possibility of the occurrence of electron–hole Kondo effects in slanting magnetic fields, which we predict to occur in magnetic fields with an orientation close to perpendicular. When the field approaches a transverse orientation a crossover from SU(2) or SU(3) symmetry into SU(4) is observed. Beilstein-Institut 2020-12-23 /pmc/articles/PMC7770385/ /pubmed/33425637 http://dx.doi.org/10.3762/bjnano.11.169 Text en Copyright © 2020, Florków et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/terms/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the author(s) and source are credited and that individual graphics may be subject to special legal provisions. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms/terms) |
spellingShingle | Full Research Paper Florków, Patryk Krychowski, Damian Lipiński, Stanisław Kondo effects in small-bandgap carbon nanotube quantum dots |
title | Kondo effects in small-bandgap carbon nanotube quantum dots |
title_full | Kondo effects in small-bandgap carbon nanotube quantum dots |
title_fullStr | Kondo effects in small-bandgap carbon nanotube quantum dots |
title_full_unstemmed | Kondo effects in small-bandgap carbon nanotube quantum dots |
title_short | Kondo effects in small-bandgap carbon nanotube quantum dots |
title_sort | kondo effects in small-bandgap carbon nanotube quantum dots |
topic | Full Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7770385/ https://www.ncbi.nlm.nih.gov/pubmed/33425637 http://dx.doi.org/10.3762/bjnano.11.169 |
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