Quasiparticle states in superconducting superlattices

Quasiparticle states in superconducting superlattices

Abstract. The energy bands and the global density of states are computed for superconductor / normalmetal superlattices in the clean limit. Dispersion relations are derived for the general case of insulating interfaces, including the mismatch of Fermi velocities and effective band masses. We focus on the influence of finite interface transparency and compare our results with those for transpare...

Quasiparticle-tuned superconducting mixer

We have successfully employed the recently observed quasiparticle admittance of a superconducting tunnel junction as the tuning element for a superconductorinsulator-superconductor mixer. This is the first demonstration of an electronic on-chip tuning element for a superconducting detector. We observe an increase in the dynamic resistance and an improvement in mixer gain and noise temperature a...

Quasiparticle scattering interference in superconducting iron pnictides

Using both two orbital and five orbital models, we investigate the quasiparticle interference QPI patterns in the superconducting SC state of iron-based superconductors. We compare the results for nonmagnetic and magnetic impurities in sign-changed s-wave cos kx · cos ky and sign-unchanged cos kx · cos ky SC states. While the patterns strongly depend on the chosen band structure details, the se...

Normal-metal quasiparticle traps for superconducting qubits

R.-P. Riwar,1,2 A. Hosseinkhani,1,3 L. D. Burkhart,2 Y. Y. Gao,2 R. J. Schoelkopf,2 L. I. Glazman,2 and G. Catelani1 1Peter Grünberg Institut (PGI-2) and JARA Institute for Quantum Information, Forschungszentrum Jülich, 52425 Jülich, Germany 2Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA 3JARA-Institute for Quantum Information, RWTH Aachen Univer...

Multi-quasiparticle States in 256Rf