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).

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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