Gate-Tunable Critical Current of the Three-Dimensional Niobium Nano-Bridge Josephson Junction

Abstract

Recent studies have shown that the critical currents of several metallic superconducting nanowires and Dayem bridges can be locally tuned using a gate voltage {V_g}. Here, we report a gate-tunable Josephson junction structure constructed from a three-dimensional (3D) niobium nano-bridge junction (NBJ) with a voltage gate on top. Measurements up to 6 K showed that the critical current of this structure can be tuned to zero by increasing {V_g}. The critical gate voltage Vgc was reduced to 16 V and may possibly be reduced further by reducing the thickness of the insulation layer between the gate and the NBJ. Furthermore, the flux modulation generated by Josephson interference of two parallel 3D NBJs can also be tuned using {V_g} in a similar manner. Therefore, we believe that this gate-tunable Josephson junction structure is promising for superconducting circuit fabrication at high integration levels.

15 pages, 5 figures

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Cited by in corpus (5)

• Gate control of superconducting current: Mechanisms, parameters and technological potential
• Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium
• Multimode operation of a superconducting nanowire switch in the nanosecond regime
• Microwave dynamics of gated Al/InAs superconducting nanowires
• Microscopic mechanism of electric field-induced superconductivity suppression in metallic thin films