期刊
NANO LETTERS
卷 21, 期 24, 页码 10309-10314出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03481
关键词
Field-effect; superconductivity; electrolytes; transistor; electric field
类别
资金
- European Research Council [899 315]
- EU [800 923, 964 398]
- Italian Ministry of University and Research (PRIN Project QUANTUM2D)
Recent experiments have shown the possibility of tuning the transport properties of metallic nanosized superconductors through a gate voltage, sparking renewed debate on the interaction between electrostatic fields and superconductivity. The study provides conclusive evidence for the electrostatic-field-driven control of the supercurrent in metallic nanosized superconductors, and highlights the need for a novel theory to describe the nontrivial interaction of static electric fields with conventional superconductivity.
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 similar 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.
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