Mantelli, Davide ; Moca, Catalin Pascu ; Zarand, Gergely ; Grifoni, Milena
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| Item type: | Article |
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| Journal or Publication Title: | Physica E: Low-dimensional Systems and Nanostructures |
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| Publisher: | Elsevier |
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| Volume: | 77 |
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| Page Range: | 180 - 190 |
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| Date: | March 2016 |
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| Institutions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
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| Identification Number: | | Value | Type |
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| arXiv:1507.05440v1 | arXiv ID |
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| Keywords: | Kondo effect, Carbon nanotubes, Strong coupling,Density matrix numerical renormalization group |
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| Dewey Decimal Classification: | 500 Science > 530 Physics |
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| Status: | In Press |
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| Refereed: | Yes, this version has been refereed |
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| Created at the University of Regensburg: | Partially |
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| Item ID: | 33012 |
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Abstract
We investigate the effects of spin–orbit interaction (SOI) and valley mixing on the transport and dynamical properties of a carbon nanotube (CNT) quantum dot in the Kondo regime. As these perturbations break the pseudo-spin symmetry in the CNT spectrum but preserve time-reversal symmetry, they induce a finite splitting Δ between formerly degenerate Kramers pairs. Correspondingly, a crossover from ...
Abstract
We investigate the effects of spin–orbit interaction (SOI) and valley mixing on the transport and dynamical properties of a carbon nanotube (CNT) quantum dot in the Kondo regime. As these perturbations break the pseudo-spin symmetry in the CNT spectrum but preserve time-reversal symmetry, they induce a finite splitting Δ between formerly degenerate Kramers pairs. Correspondingly, a crossover from the SU(4) to the SU(2)-Kondo effect occurs as the strength of these symmetry breaking parameters is varied. Clear signatures of the crossover are discussed both at the level of the spectral function as well as of the conductance. In particular, we demonstrate numerically and support with scaling arguments that the Kondo temperature scales inversely with the splitting Δ in the crossover regime. In presence of a finite magnetic field, time reversal symmetry is also broken. We investigate the effects of both parallel and perpendicular fields (with respect to the tube's axis) and discuss the conditions under which Kondo revivals may be achieved.
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