Electrostatic field-driven supercurrent suppression in ionic-gated metallic Josephson nanotransistors
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arXiv
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| Format: | Preprint |
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2021
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| author | Paolucci, Federico Crisà, Francesco De Simoni, Giorgio Bours, Lennart Puglia, Claudio Strambini, Elia Roddaro, Stefano Giazotto, Francesco |
| author_facet | Paolucci, Federico Crisà, Francesco De Simoni, Giorgio Bours, Lennart Puglia, Claudio Strambini, Elia Roddaro, Stefano Giazotto, Francesco |
| contents | Recent experiments have shown the possibility of tuning the transport properties of metallic nanosized superconductors through a gate voltage. These results renewed the longstanding debate on the interaction between electrostatic fields and superconductivity. Indeed, different works suggested competing mechanisms as the cause of the effect: an unconventional electric field-effect or quasiparticle injection. Here, we provide conclusive evidence for the electrostatic-field-driven control of the supercurrent in metallic nanosized superconductors, by realizing ionic-gated superconducting field-effect nanotransistors (ISFETs) where electron injection is impossible. Our Nb ISFETs show giant suppression of the superconducting critical current of up to 45%. Moreover, the bipolar supercurrent suppression observed in different ISFETs, together with invariant critical temperature and normal-state resistance, also excludes conventional charge accumulation/depletion. Therefore, the microscopic explanation of this effect calls upon a novel theory able to describe the nontrivial interaction of static electric fields with conventional superconductivity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2107_00935 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Electrostatic field-driven supercurrent suppression in ionic-gated metallic Josephson nanotransistors Paolucci, Federico Crisà, Francesco De Simoni, Giorgio Bours, Lennart Puglia, Claudio Strambini, Elia Roddaro, Stefano Giazotto, Francesco Superconductivity Mesoscale and Nanoscale Physics Recent experiments have shown the possibility of tuning the transport properties of metallic nanosized superconductors through a gate voltage. These results renewed the longstanding debate on the interaction between electrostatic fields and superconductivity. Indeed, different works suggested competing mechanisms as the cause of the effect: an unconventional electric field-effect or quasiparticle injection. Here, we provide conclusive evidence for the electrostatic-field-driven control of the supercurrent in metallic nanosized superconductors, by realizing ionic-gated superconducting field-effect nanotransistors (ISFETs) where electron injection is impossible. Our Nb ISFETs show giant suppression of the superconducting critical current of up to 45%. Moreover, the bipolar supercurrent suppression observed in different ISFETs, together with invariant critical temperature and normal-state resistance, also excludes conventional charge accumulation/depletion. Therefore, the microscopic explanation of this effect calls upon a novel theory able to describe the nontrivial interaction of static electric fields with conventional superconductivity. |
| title | Electrostatic field-driven supercurrent suppression in ionic-gated metallic Josephson nanotransistors |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2107.00935 |