Title: Circuit-theoretic phenomenological model of an electrostatic gate-controlled bi-SQUID Show Chinese title

Title: 电路理论表观模型的静电门控双SQUID

Abstract: A numerical model based on a lumped circuit element approximation for a bi-superconducting quantum interference device (bi-SQUID) operating in the presence of an external magnetic field is presented in this paper. Included in the model is the novel ability to capture the resultant behaviour of the device when a strong electric field is applied to its Josephson junctions by utilising gate electrodes. The model is used to simulate an all-metallic SNS (Al-Cu-Al) bi-SQUID, where good agreement is observed between the simulated results and the experimental data. The results discussed in this work suggest that the primary consequences of the superconducting field effect induced by the gating of the Josephson junctions are accounted for in our minimal model; namely, the suppression of the junctions super-current. Although based on a simplified semi-empirical model, our results may guide the search for a microscopic origin of this effect by providing a means to model the voltage response of gated SQUIDs. Also, the possible applications of this effect regarding the operation of SQUIDs as ultra-high precision sensors, where the performance of such devices can be improved via careful tuning of the applied gate voltages, are discussed at the end of the paper. Show Chinese abstract

Abstract: 基于集中电路元件近似方法的双超导量子干涉装置（bi-SQUID）在外部磁场存在下的数值模型在本文中提出。 该模型包括一种新能力，通过使用栅极电极，可以捕捉当强电场施加到其约瑟夫森结时器件的总体行为。 该模型用于模拟全金属的SNS（Al-Cu-Al）双SQUID，模拟结果与实验数据之间观察到良好的一致性。 本文讨论的结果表明，由约瑟夫森结的栅控引起的超导场效应的主要后果已在我们的最小模型中得到解释；即，结的超电流被抑制。 尽管基于简化的半经验模型，我们的结果可能通过提供一种建模栅控SQUID电压响应的方法，指导对这一效应微观起源的探索。 此外，在论文末尾还讨论了该效应在SQUID作为超高精度传感器操作方面的潜在应用，其中通过仔细调节施加的栅极电压可以提高此类器件的性能。