Electric field-induced superconductivity modulation in W-C nanowires
ORAL
Abstract
In recent years, the electric field-induced control of superconductivity has been observed mostly in metallic superconducting materials [1]. However, so far the occurrence of this phenomenon is not fully understood in the framework of the microscopic BCS theory and it is still under debate. Here, we present a study of the electric field-induced modulation of superconductivity in W-C nanowires fabricated using focused ion beam induced deposition [2], a single step nanolithography method. It is experimentally found by electrical transport characterization that an increasing side-gate voltage applied in the vicinity of a 45 nm-wide W-C nanowire progressively decreases its superconducting critical current, up to a full suppression of the superconducting state. A theoretical model based on the GL theory explains this modulation by the squeezing of the superconducting state by the electric field. Given their broadened working temperature range and the smaller gate voltages required to modulate superconductivity compared to other materials, W-C nanostructures are promising candidates to serve as components in future superconducting devices with electric field-induced modulation.
[1] Paolucci, F. et al., AVS Quantum Sci. 1, 016501 (2019).
[2] Orús, P. et al., Sci. Rep.11:17698 (2021).
*The project that gave rise to these results received the support of a fellowship from "la Caixa" Foundation (ID 100010434). The fellowship code is LCF/BQ/PR19/11700008. Funding from the the European Union's Horizon 2020 research and innovation programme under the grant agreement No 892427 has been received. Authors acknowledge financial support from the Spanish Ministry of Economy and Competitiveness through Projects MAT2018-102627-T and MAT2017-82970-C2-2-R, from CSIC through project PIE202060E187, and from the Aragon Regional Government (Construyendo Europa desde Aragon) through Project E13_20R, with European Social Fund funding. This work has been supported by projects H2020 (FATMOLSproject) and Excellence Unit Maria de Maeztu (CEX2019-000919-M). This work has been supported by the German Research Foundation (DFG) project #FO 956/6-1 (Germany) and European Cooperation in Science and Technology—COST Action #CA16218 (NANOCOHYBRI).
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Publication:Pablo Orús, Vladimir M. Fomin, José María De Teresa & Rosa Córdoba, "Critical current modulation induced by an electric field in superconducting tungsten‑carbon nanowires", Scientific Reports | (2021) 11:17698 | https://doi.org/10.1038/s41598-021-97075-z
Presenters
Rosa Córdoba
University of Valencia
Authors
Rosa Córdoba
University of Valencia
Vladimir M Fomin
Leibniz IFW Dresden, Germany; Moldova State University, Chisinau, Republic of Moldova
