Magnetic-field-induced transition in a quantum dot coupled to a superconductor
| Autor: | A. Garcia Corral, Serge Florens, D. M. T. van Zanten, Hervé Courtois, Clemens Winkelmann, Katharina J. Franke |
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| Přispěvatelé: | Nano-Electronique Quantique et Spectroscopie (QuNES), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Fachbereich Physik [Berlin], Freie Universität Berlin, Théorie Quantique des Circuits (ThQC) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Coulomb blockade
Kondo effect FOS: Physical sciences 02 engineering and technology Proximity effect 01 natural sciences Andreev reflection Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Proximity effect (superconductivity) Singlet state 010306 general physics Computer Science::Databases Spin-½ Physics Superconductivity Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics High Energy Physics::Phenomenology 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] Magnetic field STATES Condensed Matter::Strongly Correlated Electrons Impurities in superconductors 0210 nano-technology Magnetic impurity |
| Zdroj: | Corral, A G, van Zanten, D M T, Franke, K J, Courtois, H, Florens, S & Winkelmann, C B 2020, ' Magnetic-field-induced transition in a quantum dot coupled to a superconductor ', Physical Review Research, vol. 2, no. 1, 012065 . https://doi.org/10.1103/PhysRevResearch.2.012065 Physical Review Research Physical Review Research, American Physical Society, 2020, 2 (1), pp.012065(R). ⟨10.1103/PhysRevResearch.2.012065⟩ |
| ISSN: | 2643-1564 |
| Popis: | The magnetic moment of a quantum dot can be screened by its coupling to a superconducting reservoir, depending on the hierarchy of the superconducting gap and the relevant Kondo scale. This screening-unscreening transition can be driven by electrostatic gating, tunnel coupling, and, as we demonstrate here, magnetic field. We perform high-resolution spectroscopy of subgap excitations near the screening-unscreening transition of asymmetric superconductor - quantum dot - superconductor (S-QD-S) junctions formed by the electromigration technique. Our measurements reveal a re-entrant phase boundary determined by the competition between Zeeman energy and gap reduction with magnetic field. We further track the evolution of the phase transition with increasing temperature, which is also evidenced by thermal replicas of subgap states. 15 pages, including Supp. Info. file |
| Databáze: | OpenAIRE |
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