We have measured the ac Josephson effect in small-area superconducting tunnel junctions at 604 GHz (A = 496pm) using a resonant planar dipole antenna to couple the radiation into the junction. In a 176-fl junction, we have observed up to the 7th Josephson step (at 8.75 m V), a performance comparable to that seen in point contacts. We also compare our data with the results of the RSJ model and o...

We study the Josephson effect in alkali atomic gases within the two-mode approximation and show that there is a correspondence between the Bogoliubov description and the harmonic limit of the phase representation. We demonstrate that the quanta of the Josephson plasmon can be identified with the Bogoliubov excitations of the two-site Bose fluid. We thus establish a mapping between the Bogoliubo...

We consider a Josephson junction where the weak-link is formed by a non-centrosymmetric ferromagnet. In such a junction, the superconducting current acts as a direct driving force on the magnetic moment. We show that the a.c. Josephson effect generates a magnetic precession providing then a feedback to the current. Magnetic dynamics result in several anomalies of current-phase relations (second...

We measure the high-frequency emission of a single Cooper pair transistor (SCPT) in the regime where transport is only due to tunneling of Cooper pairs. This is achieved by coupling on chip the SCPT to a superconductor-insulator-superconductor junction and by measuring the photon assisted tunneling current of quasiparticles across the junction. This technique allows a direct detection of the ac...

Although simple theoretical descriptions of the Shapiro effect focus on a voltage biased superconducting Josephson junction, experimental measurements are predominantly made using current biased systems. In an analogous superfluid He system, a Josephson weak link can be predominantly pressure biased in accordance with the simple theory. Here, we use numerical methods to reproduce new features f...

The Josephson effect is especially appealing to physicists because it reveals macroscopically the quantum order and phase. In excitonic bilayers the effect is even subtler due to the counterflow of supercurrent as well as the tunneling between layers (interlayer tunneling). Here we study, in a quantum Hall bilayer, the excitonic Josephson junction: a conjunct of two exciton condensates with a r...

The transport critical current in high-Tc superconducting systems is considerably limited by the microstructural characteristics of these materials [1]. Indeed, if we schematize these systems as a collection of weakly-coupled superconducting islands, we may adopt Josephson junction network models to describe their electrodynamic response. With the aid of these models one can show that the maxim...

The defining property of a superconductor is the stiffness of its phase. In conventional lowTc superconductors this stiffness is so large that in order to directly observe its finite value one has to create a region where it is locally suppressed, the so-called superconducting weak link. The resulting weak link region gives rise to a variety of Josephson effects (for a review, see [1]), in whic...

Modulation of the critical current across layers, I c (H), of stacked Josephson junctions (SJJs) as a function of an applied magnetic field parallel to the junction planes is studied theoretically and experimentally for different junction lengths and coupling parameters. It is shown that the I c (H) patterns of long SJJs are very complicated without periodicity in H. This is due to interaction ...