Lahiri, Aritra and Hata, Tokuro and Smirnov, Sergey and Ferrier, Meydi and Arakawa, Tomonori and Niklas, Michael and Marganska, Magdalena and Kobayashi, Kensuke and Grifoni, Milena (2020) Unraveling a concealed resonance by multiple Kondo transitions in a quantum dot. PHYSICAL REVIEW B, 101 (4): 041102. ISSN 2469-9950, 2469-9969
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Kondo correlations are responsible for the emergence of a zero-bias peak in the low temperature differential conductance of Coulomb blockaded quantum dots. In the presence of a global SU(2) circle times SU(2) symmetry, which can be realized in carbon nanotubes, they also inhibit inelastic transitions which preserve the Kramers pseudospins associated to the symmetry. We report on magnetotransport experiments on a Kondo correlated carbon nanotube where resonant features at the bias corresponding to the pseudospin-preserving transitions are observed. We attribute this effect to a simultaneous enhancement of pseudospin-nonpreserving transitions occurring at that bias. This process is boosted by asymmetric tunneling couplings of the two Kramers doublets to the leads and by asymmetries in the potential drops at the leads. Hence, the present work discloses a fundamental microscopic mechanisms ruling transport in Kondo systems far from equilibrium.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANDERSON MODEL; TRANSPORT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Apr 2021 06:53 |
| Last Modified: | 09 Apr 2021 06:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/45365 |
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