Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium  

作　　者：Jennifer Koch Carla Cirillo Sebastiano Battisti Leon Ruf Zahra Makhdoumi Kakhaki Alessandro Paghi Armen Gulian Serafim Teknowijoyo Giorgio De Simoni Francesco Giazotto Carmine Attanasio Elke Scheer Angelo Di Bernardo 

机构地区：[1]Department of Physics,University of Konstanz,Universitätsstraße 10,78464 Konstanz,Germany [2]CNR-Spin,c/o Universitàdegli Studi di Salerno,via Giovanni Paolo II 132,84084 Fisciano(SA),Italy [3]NEST,Istituto Nanoscienze-CNR and Scuola Normale Superiore,Piazza San Silvestro 12,56127 Pisa,Italy [4]Dipartimento di Fisica“E.R.Caianiello”,Universitàdegli Studi di Salerno,Via Giovanni Paolo II 132,84084 Fisciano(SA),Italy [5]Advanced Physics Laboratory,Institute for Quantum Studies,Chapman University,Burtonsville,MD 20866,USA

出　　处：《Nano Research》2024年第7期6575-6581,共7页纳米研究（英文版）

基　　金：the European Union’s Horizon 2020 Research and Innovation Program under Grant Agreement No.964398(SuperGate);the US ONR(Nos.N00014-21-1-2879,N00014-20-1-2442,and N00014-23-1-2866).

摘　　要：The application of a gate voltage to control the superconducting current flowing through a nanoscale superconducting constriction,named as gate-controlled supercurrent(GCS),has raised great interest for fundamental and technological reasons.To gain a deeper understanding of this effect and develop superconducting technologies based on it,the material and physical parameters crucial for the GCS effect must be identified.Top-down fabrication protocols should also be optimized to increase device scalability,although studies suggest that top-down fabricated devices are more resilient to show a GCS.Here,we investigate gated superconducting nanobridges made with a top-down fabrication process from thin films of the noncentrosymmetric superconductor niobium rhenium with varying ratios of the constituents(NbRe).Unlike other devices previously reported and made with a top-down approach,our NbRe devices systematically exhibit a GCS effect when they were fabricated from NbRe thin films with small grain size and etched in specific conditions.These observations pave the way for the realization of top-down-made GCS devices with high scalability.Our results also imply that physical parameters like structural disorder and surface physical properties of the nanobridges,which can be in turn modified by the fabrication process,are crucial for a GCS observation,providing therefore also important insights into the physics underlying the GCS effect.

关 键 词：superconductivity non-centrosymmetric superconductors superconducting devices gated devices gate-controlled supercurrent top-down fabrication 

分 类 号：TB383[一般工业技术—材料科学与工程]