Geometric Scaling of the Current-Phase Relation of Niobium Nanobridge Junctions.
basic_science · Level V
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- Record sourced from PubMed, PMID 37573571.
- Also identified by DOI 10.1021/acsnano.3c01301.
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Abstract
The nanobridge junction (NBJ) is a type of Josephson junction that is advantageous for the miniaturization of superconducting circuits. However, the current-phase relation (CPR) of the NBJ usually deviates from a sinusoidal function, which has been explained by a simplified model with correlation only to its effective length. Here, we investigated both measured and calculated CPRs of niobium NBJs of a cuboidal shape with a three-dimensional bank structure. From a sine-wave to a sawtooth-like form, we showed that deviated CPRs of NBJs can be described quantitatively by its skewness Δθ. Furthermore, the measured dependence of Δθ on the critical current <i>I</i><sub>0</sub> from 108 NBJs turned out to be consistent with the calculated dependence derived from the change in geometric dimensions. This suggested that the CPRs of NBJs can be tuned by their geometric dimensions. In addition, the calculated scaling behavior of Δ<i>θ</i> versus <i>I</i><sub>0</sub> in 3D space was provided for the future design of superconducting circuits of a high integration level by using niobium NBJs.