Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot
| Autor: | Tokuro Hata, Milena Grifoni, Sergey Smirnov, Kensuke Kobayashi, Aritra Lahiri, Michael Niklas, Tomonori Arakawa, Meydi Ferrier, Magdalena Marganska |
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| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
ANDERSON MODEL TRANSPORT FOS: Physical sciences 02 engineering and technology Carbon nanotube 01 natural sciences Resonance (particle physics) law.invention Condensed Matter - Strongly Correlated Electrons law 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Coulomb Autocatalytic reaction 010306 general physics Quantum tunnelling Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) ddc:530 021001 nanoscience & nanotechnology 530 Physik Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Symmetry (physics) Quantum dot Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| DOI: | 10.48550/arxiv.1908.11129 |
| Popis: | 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. Comment: main: 5 pages, 4 figures, supplementary: 20 pages, 8 figures |
| Databáze: | OpenAIRE |
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