Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium
N. W. Hendrickx, M. L. V. Tagliaferri, M. Kouwenhoven, R. Li, D. P. Franke, A. Sammak, A. Brinkman, G. Scappucci, M. Veldhorst
DOI 10.1103/PhysRevB.99.075435 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We fabricate Josephson field-effect transistors in germanium quantum wells contacted by superconducting aluminum and demonstrate supercurrents carried by holes that extend over junction lengths of several micrometers. In superconducting quantum point contacts we observe discretization of supercurrent, as well as Fabry-Pérot resonances, demonstrating ballistic transport. The magnetic field dependence of the supercurrent follows a clear Fraunhofer-like pattern, and Shapiro steps appear upon microwave irradiation. Multiple Andreev reflections give rise to conductance enhancement and evidence a transparent interface, confirmed by analyzing the excess current. These demonstrations of ballistic superconducting transport are promising for hybrid quantum technology in germanium.
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. | 1.52 | Pressure not reported | unknown |
Similar papers
Transparent Semiconductor-Superconductor Interface and Induced Gap in an Epitaxial Heterostructure Josephson Junction
similarity 0.93M. Kjaergaard et al.
Source status unknown — claims are unverified
Enhanced Josephson coupling in hybrid nanojunctions
similarity 0.93Domenico Montemurro et al.
Source status unknown — claims are unverified
Observation of phase fluctuations and electron-electron scattering in weakly disordered superconducting aluminum films
similarity 0.93Soon-Gul Lee & Thomas R. Lemberger
Source status unknown — claims are unverified
Joule heating effects in high-transparency Josephson junctions
similarity 0.93Matti Tomi et al.
Source status unknown — claims are unverified
Voltage-Tuned Anomalous-Metal to Metal Transition in Hybrid Josephson Junction Arrays
similarity 0.92S. Sasmal et al.
Source status unknown — claims are unverified
Electrodynamics of granular aluminum from superconductor to insulator: Observation of collective superconducting modes
similarity 0.92F. Levy-Bertrand et al.
Source status unknown — claims are unverified