Josephson Inductance as a Probe for Highly Ballistic Semiconductor-Superconductor Weak Links
Christian Baumgartner, Lorenz Fuchs, Linus Frész, Simon Reinhardt, Sergei Gronin, Geoffrey C. Gardner, Michael J. Manfra, Nicola Paradiso, Christoph Strunk
DOI 10.1103/PhysRevLett.126.037001 · Physical Review Letters
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Abstract
We present simultaneous measurements of Josephson inductance and dc transport characteristics of ballistic Josephson junctions based upon an epitaxial Al-InAs heterostructure. The Josephson inductance at finite current bias directly reveals the current-phase relation. The proximity-induced gap, the critical current and the average value of the transparency τ¯ are extracted without need for phase bias, demonstrating, e.g., a near-unity value of τ¯=0.94. Our method allows us to probe the devices deeply in the nondissipative regime, where ordinary transport measurements are featureless. In perpendicular magnetic field the junctions show a nearly perfect Fraunhofer pattern of the critical current, which is insensitive to the value of τ¯. In contrast, the signature of supercurrent interference in the inductance turns out to be extremely sensitive to τ¯.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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