Enhanced Superconductivity and Infinite Electro-resistance in Proximity Exchange Coupled Superconductor Nano-bridges by Electric Field - towards First Generation of Triplet Paired Superconductor FETs

ORAL

Abstract

Recent breakthrough experiments on BCS superconductor based nano-bridges showed electric field control of the critical current (Ic) [1]. Their fundamental interest and high potential for cryogenic-nanoelectronics with this new type of all-metallic superconducting field-effect transistors (SuFETs) make them highly attractive. Here, we present results of gating experiments on superconducting thin NbN film (Tc ~12 K) based nano-SuFETs which show a tunable infinite electro-resistance (ER). Interestingly, we observe an enhancement in the Ic in stark contrast to the earlier work where a suppression of Ic was seen [1]. The observed ER is a consequence of a monotonic enhancement of the Ic (~25%) on applying electrostatic field through back-gate voltage in the range of ±30 V. Importantly, similar results are obtained in proximity coupled NbN/ferromagnetic-insulator nano-bridges. The ability to tune the superconducting properties of NbN layer with magnetic and electric fields will be discussed. This could lead to a novel triplet superconductor with exchange field [2] based SuFETs.

[1] De Simoni, G et al., Nat. Nanotechnol. 13, 802 (2018).
[2] Bergeret, FS, Volkov, AF & Efetov, KB, Rev. Mod. Phys. 77, 1321 (2005).

*H2020-MSCA-IF No.796603–EuSuper, ONR (N00014-16-1-2657) and NSF (DMR 1700137).

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Presenters

  • Mirko Rocci

    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT
    • Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology

Authors

  • Mirko Rocci

    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT
    • Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology

  • Gilvania Da Silva Vilela

    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT and Universidade de Pernambuco
    • Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, MIT and Universidade de Pernambuco

  • Dhavala Suri

    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT
    • Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, MASSACHUSETTS INSTITUTE OF TECHNOLOGY

  • Jagadeesh Moodera

    • Dept. Of Physics, Plasma Science and Fusion Center and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • MIT
    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Department of Physics, Plasma Science and Fusion Center, and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT
    • Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, and Department of Physics, MIT
    • Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology
    • Physics, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • Department of Physics, MIT, Cambridge, MA, 02139