• 文献标题:   Graphene-based tunable SQUIDs
  • 文献类型:   Article
  • 作  者:   THOMPSON MD, BEN SHALOM M, GEIM AK, MATTHEWS AJ, WHITE J, MELHEM Z, PASHKIN YA, HALEY RP, PRANCE JR
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951 EI 1077-3118
  • 通讯作者地址:   Univ Lancaster
  • 被引频次:   4
  • DOI:   10.1063/1.4981904
  • 出版年:   2017

▎ 摘  要

The superconducting proximity effect in graphene can be used to create Josephson junctions with critical currents that can be tuned using local field-effect gates. These junctions have the potential to add functionality to existing technologies; for example, superconducting quantum interference device (SQUID) magnetometers with adaptive dynamic range and superconducting qubits with fast electrical control. Here, we present measurements of graphene-based superconducting quantum interference devices incorporating ballistic Josephson junctions that can be controlled individually. We investigate the magnetic field response of the SQUIDs as the junctions are gated and as the device is tuned between symmetric and asymmetric configurations. We find a highest transfer function approximate to 300 mu V/Phi(0), which compares favorably with conventional, low temperature DC SQUIDs. With low noise readout electronics and optimised geometries, devices based on ballistic graphene Josephson junctions have the potential to match the sensitivity of traditional SQUIDs while also providing additional functionality. (C) 2017 Author(s).