The impact of kinetic inductance on the critical current oscillations of nanobridge SQUIDs

Abstract

In this work, we study the current phase relation ($C\Phi R$) of lithographically fabricated molybdenum germanium (MoGe) nanobridges, which is intimately linked to the nanobridge kinetic inductance. We do this by imbedding the nanobridges in a SQUID. We observe that for temperatures far below $T_c$, the $C\Phi R$ is linear as long as the condensate is not weakened by the presence of supercurrent. We demonstrate lithographic control over the nanobridge kinetic inductance, which scales with the nanobridge aspect ratio. This allows to tune the SQUID $I_c(B)$ characteristic. The SQUID properties that can be controlled in this way include the SQUID sensitivity and the positions of the critical current maxima. These observations can be of use for the design and operation of future superconducting devices such as magnetic memories or flux qubits.

References in corpus (3)

• Inherent stochasticity of superconductive-resistive switching in nanowires
• The unusual thickness dependence of superconductivity in $\alpha$-MoGe thin films
• Superconducting quantum interference device without Josephson junctions

Cited by in corpus (6)

• Current-phase relation of a WTe2 Josephson junction
• Limitations of the current-phase relation measurements by an asymmetric dc-SQUID
• Metastable states and hidden phase slips in nanobridge SQUIDs
• Diode effect in Shapiro steps in an asymmetric SQUID with a superconducting nanobridge
• Nonvolatile Cryogenic Phase Slip Memory with Single-Shot Readout
• Diamond-shaped evolution of the superconducting interference pattern in NbTiN weak-link Josephson junctions