Superconducting nanoribbon with a constriction: A quantum-confined Josephson junction
arXiv:1803.02709 · doi:10.1103/PhysRevB.97.134514
Abstract
Extended defects are known to strongly affect nanoscale superconductors. Here we report the properties of superconducting nanoribbons with a constriction formed between two adjacent step-edges, by solving the Bogoliubov-de Gennes equations self-consistently in the regime where quantum confinement is important. Since the quantum resonances of the superconducting gap in the constricted area are different from the rest of the nanoribbon, such constriction forms a quantum-confined S-S'-S Josephson junction, with a broadly tunable performance depending on the length and width of the constriction with respect to the nanoribbon, and possible gating. These findings provide an intriguing approach to further tailor superconducting quantum devices where Josephson effect is of use.
arXiv comment11 pages, 13 figures
References in corpus (24)
- Superconducting nanowire single-photon detectors: physics and applications
- The Flux Qubit Revisited to Enhance Coherence and Reproducibility
- Scanning nano-SQUID with single electron spin sensitivity
- Surface participation and dielectric loss in superconducting qubits
- Imaging of super-fast dynamics and flow instabilities of superconducting vortices
- Hard Superconductivity of a Soft Metal in the Quantum Regime
- Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon
- Observation of shell effects in superconducting nanoparticles of Sn
- The gap amplification at a "shape resonance" in a superlattice of quantum stripes: a mechanism for high Tc
- Two-dimensional Superconductors with Atomic-scale Thicknesses
- High coherence hybrid superconducting qubit
- Graphene-based Josephson junction single photon detector
- Imaging Josephson Vortices on the Surface Superconductor Si(111)-(root7xroot3)-In using a Scanning Tunneling Microscope
- Dimensional crossover and incipient quantum size effects in superconducting niobium nanofilms
- Quantum size effects on the perpendicular upper critical field in ultra-thin lead films
- Solution of the Bogoliubov-de Gennes equations at zero temperature throughout the BCS-BEC crossover: Josephson and related effects
- Shape resonances in the superconducting order parameter of ultrathin nanowires
- A three-junction SQUID-on-tip with tunable in-plane and out-of-plane magnetic field sensitivity
- Proximity effect in clean strong/weak/strong superconducting tri-layers
- Enhancement and termination of the superconducting proximity effect due to atomic-scale defects visualized by scanning tunneling microscopy
- Superconducting transition temperature of Pb nanofilms: Impact of the thickness-dependent oscillations of the phonon mediated electron-electron coupling
- Strong dopant dependence of electric transport in ion-gated MoS2
- Electrically tunable multi-terminal SQUID-on-tip
- Multifaceted impact of a surface step on superconductivity in atomically thin films