Enhanced Shot Noise of Multiple Andreev Reflections in a Carbon Nanotube Quantum Dot in SU(2) and SU(4) Kondo regimes
| Autor: | Kensuke Kobayashi, Raphaelle Delagrange, Tokuro Hata, Tomonori Arakawa, Meydi Ferrier, Hélène Bouchiat, R. Deblock, Sanghyun Lee |
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| Přispěvatelé: | Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Center for Spintronics Research Network (CSRN ), Graduate School of Engineering Science [Toyonaka, Osaka], Osaka University-Osaka University, Quantum Information and Quantum Biology Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Toyonaka, Osaka 560-0043, Japan, Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka 560-8531, Japan |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Superconductivity Fano factor Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Shot noise FOS: Physical sciences General Physics and Astronomy Biasing 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Gate voltage 01 natural sciences Carbon nanotube quantum dot Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Kondo effect 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall] Special unitary group |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2018, 121 (24), ⟨10.1103/PhysRevLett.121.247703⟩ |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.121.247703 |
| Popis: | The sensitivity of shot noise to the interplay between Kondo correlations and superconductivity is investigated in a carbon nanotube quantum dot connected to superconducting electrodes. Depending on the gate voltage, the SU(2) and SU(4) Kondo unitary regimes can be clearly identified. We observe enhancement of the shot noise via the Fano factor in the superconducting state. Its divergence at low bias voltage, which is more pronounced in the SU(4) regime than in the SU(2) one, is larger than what is expected from proliferation of multiple Andreev reflections predicted by the existing theories. Our result suggests that the Kondo effect is responsible for this strong enhancement. |
| Databáze: | OpenAIRE |
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