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Josephson inductance as a probe for highly ballistic semiconductor-superconductor weak links
- Source :
- Phys. Rev. Lett. 126, 037001 (2021)
- Publication Year :
- 2020
-
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 $\bar{\tau}$ are extracted without need for phase bias, demonstrating, e.g.,~a near-unity value of $\bar{\tau}=0.94$. Our method allows us to probe the devices deeply in the non-dissipative 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 $\bar{\tau}$. In contrast, the signature of supercurrent interference in the inductance turns out to be extremely sensitive to $\bar{\tau}$.<br />Comment: 13 pages, 13 figures
- Subjects :
- Condensed Matter - Superconductivity
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 126, 037001 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2007.08371
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.126.037001