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TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)

Superconducting transistor.

Ushio KAWABE, Toshikazu Nishino

Published Jan 1, 1986• 0 citations
Publisher

Abstract

A three-terminal superconducting devise composed of a semiconductor coupled Josephson junction and an oxide-insulated gate was described. It was possible to control the superconducting coherence length ξn in the semiconductor by applying a gate voltage; consequently, the junction's superconducting critical current, which depends on ξn, was changeable. Power dissipation and switching time constant would be expected to be approximately 1μW and 10ps, respectively.

DOI
10.2221/jcsj.21.315

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A three-terminal superconducting devise composed of a semiconductor coupled Josephson junction and an oxide-insulated gate was described. It was possible to control the superconducting coherence length ξn in the semiconductor by applying a gate voltage; consequently, the junction's superconducting critical current, which depends on ξn, was changeable. Power dissipation and switching time constant would be expected to be approximately 1μW and 10ps, respectively.
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The transport properties of a small superconductor--normal-metal--superconducting tunnel junction can be controlled by a gate electrode coupled capacitively to the central island. We evaluate the critical Josephson current Ic{\mathit{I}}_{\mathit{c}}Ic​ through such a system as a function of the gate voltage Vg{\mathit{V}}_{\mathit{g}}Vg​ taking into account parity effects in the superconductors. The dependence Ic{\mathit{I}}_{\mathit{c}}Ic​(Vg{\mathit{V}}_{\mathit{g}}Vg​) shows resonant singularities and has a qualitatively different character for \ensuremath{\Delta}EC{\mathit{E}}_{\mathit{C}}EC​ and \ensuremath{\Delta}>EC{\mathit{E}}_{\mathit{C}}EC​, \ensuremath{\Delta} being the superconducting gap and EC{\mathit{E}}_{\mathit{C}}EC​=e2{\mathit{e}}^{2}e2/2C being the charging energy. Due to the sweeping of the gate voltage, the system can be driven to states which are metastable with respect to a change of the number of electrons on the central island. Since the lifetime of the metastable states can be macroscopically large, one can observe a remarkable bistability of the Josephson current. A weak magnetic field suppresses the interference of the electrons propagating through the central electrode, and, consequently, the magnitude of the critical current.