Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2019
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| _version_ | 1866917009263951872 |
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| author | Lahiri, Aritra Hata, Tokuro Smirnov, Sergey Ferrier, Meydi Arakawa, Tomonori Niklas, Michael Marganska, Magdalena Kobayashi, Kensuke Grifoni, Milena |
| author_facet | Lahiri, Aritra Hata, Tokuro Smirnov, Sergey Ferrier, Meydi Arakawa, Tomonori Niklas, Michael Marganska, Magdalena Kobayashi, Kensuke Grifoni, Milena |
| contents | 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)$\otimes$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-non-preserving 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1908_11129 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot Lahiri, Aritra Hata, Tokuro Smirnov, Sergey Ferrier, Meydi Arakawa, Tomonori Niklas, Michael Marganska, Magdalena Kobayashi, Kensuke Grifoni, Milena Strongly Correlated Electrons Mesoscale and Nanoscale Physics 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)$\otimes$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-non-preserving 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. |
| title | Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/1908.11129 |