Interplay between Kondo physics and spin-orbit coupling in carbon nanotube quantum dots
We investigate the influence of spin-orbit coupling on the Kondo effects in carbon nanotube quantum dots, using the numerical renormalization group technique. A sufficiently large spin-orbit coupling is shown to destroy the SU(4) Kondo effects at zero magnetic field, leaving only two SU(2) Kondo eff...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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2009
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| _version_ | 1826300738145353728 |
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| author | Galpin, MR Jayatilaka, F Logan, D Anders, F |
| author_facet | Galpin, MR Jayatilaka, F Logan, D Anders, F |
| author_sort | Galpin, MR |
| collection | OXFORD |
| description | We investigate the influence of spin-orbit coupling on the Kondo effects in carbon nanotube quantum dots, using the numerical renormalization group technique. A sufficiently large spin-orbit coupling is shown to destroy the SU(4) Kondo effects at zero magnetic field, leaving only two SU(2) Kondo effects in the one- and three-electron Coulomb blockade valleys. On applying a finite magnetic field, two additional, spin-orbit induced SU(2) Kondo effects arise in the three- and two-electron valleys. Using physically realistic model parameters, we calculate the differential conductance over a range of gate voltages, temperatures and fields. The results agree well with measurements from two different experimental devices in the literature, and explain a number of observations that are not described within the standard framework of the SU(4) Anderson impurity model. |
| first_indexed | 2024-03-07T05:21:44Z |
| format | Journal article |
| id | oxford-uuid:df265185-f24a-4dea-a916-0337c77cc84a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:21:44Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:df265185-f24a-4dea-a916-0337c77cc84a2022-03-27T09:37:21ZInterplay between Kondo physics and spin-orbit coupling in carbon nanotube quantum dotsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:df265185-f24a-4dea-a916-0337c77cc84aEnglishSymplectic Elements at Oxford2009Galpin, MRJayatilaka, FLogan, DAnders, FWe investigate the influence of spin-orbit coupling on the Kondo effects in carbon nanotube quantum dots, using the numerical renormalization group technique. A sufficiently large spin-orbit coupling is shown to destroy the SU(4) Kondo effects at zero magnetic field, leaving only two SU(2) Kondo effects in the one- and three-electron Coulomb blockade valleys. On applying a finite magnetic field, two additional, spin-orbit induced SU(2) Kondo effects arise in the three- and two-electron valleys. Using physically realistic model parameters, we calculate the differential conductance over a range of gate voltages, temperatures and fields. The results agree well with measurements from two different experimental devices in the literature, and explain a number of observations that are not described within the standard framework of the SU(4) Anderson impurity model. |
| spellingShingle | Galpin, MR Jayatilaka, F Logan, D Anders, F Interplay between Kondo physics and spin-orbit coupling in carbon nanotube quantum dots |
| title | Interplay between Kondo physics and spin-orbit coupling in carbon
nanotube quantum dots |
| title_full | Interplay between Kondo physics and spin-orbit coupling in carbon
nanotube quantum dots |
| title_fullStr | Interplay between Kondo physics and spin-orbit coupling in carbon
nanotube quantum dots |
| title_full_unstemmed | Interplay between Kondo physics and spin-orbit coupling in carbon
nanotube quantum dots |
| title_short | Interplay between Kondo physics and spin-orbit coupling in carbon
nanotube quantum dots |
| title_sort | interplay between kondo physics and spin orbit coupling in carbon nanotube quantum dots |
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