Superconducting Field-Effect Devices

T.Y. Hsiang, Roman Sobolewski

A transistor-like three-terminal superconducting device-the superconductive magnetoelectric field-effect transistor (SMET)-is described. The SMET represents a field-controlled Josephson device with its control based on the magnetoelectric effect. The device is characterized by a very high input-output isolation because the input is strictly voltage-controlled. As such, it may be useful for interconnecting voltage-controlled semiconductor electronics with current-controlled superconducting devices. The design considerations are reviewed, and preliminary experimental results are presented. Possible other practical applications are also discussed.>

J.C. Gallop, Luning Hao, J.C. Macfarlane

W.S. Khokle, Ravish Gupta

Ilya Golokolenov, A. Guthrie, S. Kafanov +2 more

Superconducting quantum devices offer numerous applications, from electrical metrology and magnetic sensing to energy-efficient high-end computing and advanced quantum information processing. The key elements of quantum circuits are (single and double) Josephson junctions controllable either by electric current or magnetic field. The voltage control, commonly used in semiconductor-based devices via the electrostatic field effect, would be far more versatile and practical. Hence, the field effect recently reported in superconducting devices may revolutionise the whole field of superconductor electronics provided it is confirmed. Here we show that the suppression of the critical current attributed to the field effect, can be explained by quasiparticle excitations in the constriction of superconducting devices. Our results demonstrate that a miniscule leakage current between the gate and the constriction of devices perfectly follows the Fowler-Nordheim model of electron field emission from a metal electrode and injects quasiparticles with energies sufficient to weaken or even suppress superconductivity.

Yonuk Chong, Yong‐ho Lee, Yong Hamb KIM

Ilya Golokolenov, A. Guthrie, S. Kafanov +2 more

Abstract Superconducting quantum devices offer numerous applications, from electrical metrology and magnetic sensing to energy-efficient high-end computing and advanced quantum information processing. The key elements of quantum circuits are (single and double) Josephson junctions controllable either by electric current or magnetic field. The voltage control, commonly used in semiconductor-based devices via the electrostatic field effect, would be far more versatile and practical. Hence, the field effect recently reported in superconducting devices may revolutionise the whole field of superconductor electronics provided it is confirmed. Here we show that the suppression of the critical current attributed to the field effect, can be explained by quasiparticle excitations in the constriction of superconducting devices. Our results demonstrate that a miniscule leakage current between the gate and the constriction of devices perfectly follows the Fowler-Nordheim model of electron field emission from a metal electrode and injects quasiparticles with energies sufficient to weaken or even suppress superconductivity.