103 citations · 411 across the 25 of their papers we have counts for
23 papers · 1 filter
Field Cooled Annular Josephson Tunnel Junctions
Roberto Monaco, Jesper Mygind, Valery P. Koshelets
We investigate the physics of planar annular Josephson tunnel junctions quenched through their transition temperature in the presence of an external magnetic field. Experiments car…
Flux Flow Effects in Annular Josephson Tunnel Junctions
Roberto Monaco, Jesper Mygind, Valery P. Koshelets
We investigate Josephson flux-flow in annular Josephson tunnel junctions (AJTJs) under the application of magnetic fields generating finite-voltage steps in their current-voltage c…
Traveling Electromagnetic Waves in Annular Josephson Tunnel Junctions
Roberto Monaco
It is well known that long Josephson tunnel junctions (JTJs) act as active transmission lines for the slow-mode propagation of magnetic flux-quanta (in the form of solitary waves)…
Confocal Annular Josephson Tunnel Junctions with Large Eccentricity
Roberto Monaco, Jesper Mygind, Lyudmila V. Filippenko
Confocal Annular Josephson Tunnel Junctions (CAJTJs) which are the natural generalization of the circular annular Josephson tunnel junctions, have a rich nonlinear phenomenology du…
Josephson Vortex Qubit based on a Confocal Annular Josephson Junction
Roberto Monaco, Jesper Mygind, Valery P. Koshelets
We report theoretical and experimental work on the development of a Josephson vortex qubit based on a confocal annular Josephson tunnel junction (CAJTJ). The key ingredient of this…
Superelliptic Josephson Tunnel Junctions
Roberto Monaco
The most important practical characteristic of a Josephson junction is its critical current. The shape of the junction determines the specific form of the magnetic-field dependence…
The Critical Current of Point Symmetric Josephson Tunnel Junctions
Roberto Monaco
The physics of Josephson tunnel junctions drastically depends on their geometrical configurations. The shape of the junction determines the specific form of the magnetic-field depe…
Engineering Double-Well Potentials with Variable-Width Annular Josephson Tunnel Junctions
Roberto Monaco
Long Josephson tunnel junction are non-linear transmission lines that allow propagation of current vortices (fluxons) and electromagnetic waves and are used in various applications…
Confocal Annular Josephson Tunnel Junctions
Roberto Monaco
The physics of Josephson tunnel junctions drastically depends on their geometrical configurations and here we show that also tiny geometrical details play a determinant role. More…
Elliptic Annular Josephson Tunnel Junctions in an external magnetic field: The dynamics
Roberto Monaco, Jesper Mygind
We analyze the dynamics of a magnetic flux quantum (current vortex) trapped in a current-biased long planar elliptic annular Josephson tunnel junction. The system is modeled by a p…
Elliptic Annular Josephson Tunnel Junctions in an external magnetic field: The statics
Roberto Monaco, Carmine Granata, Antonio Vettoliere +1
We have investigated the static properties of one-dimensional planar Josephson tunnel junctions in the most general case of elliptic annuli. We have analyzed the dependence of the…
Gaussianity revisited: Exploring the Kibble-Zurek mechanism with superconducting rings
D. J. Weir, R. Monaco, V. P. Koshelets +2
In this paper we use spontaneous flux production in annular superconductors to shed light on the Kibble-Zurek scenario. In particular, we examine the effects of finite size and ext…
Self-field effects in window-type Josephson tunnel junctions
Roberto Monaco, Valery P. Koshelets, Anna Mukhortova +1
The properties of Josephson devices are strongly affected by geometrical effects such as those associated with the magnetic field induced by the bias current. The generally adopted…
Magnetic Sensors Based on Long Josephson Tunnel Junctions - An Alternative to SQUIDs
Roberto Monaco
The properties of Josephson devices are strongly affected by geometrical effects. A loop-shaped superconducting electrode tightly couples a long Josephson tunnel junction with the…
Long Josephson Tunnel Junctions with Doubly Connected Electrodes
Roberto Monaco, Jesper Mygind, Valery K. Koshelets
In order to mimic the phase changes in the primordial Big Bang, several "cosmological" solid-state experiments have been conceived, during the last decade, to investigate the spont…
Current Amplification with Vertical Josephson Interferometers
Roberto Monaco
It has long been recognized that a control current injected into the section of a two-junction superconducting quantum interference device (SQUID) is able to produce a change…
Josephson Tunnel Junctions in a Magnetic Field Gradient
Roberto Monaco, Jesper Mygind, Valery Koshelets
We measured the magnetic field dependence of the critical current of high quality Nb-based planar Josephson tunnel junctions in the presence of a controllable non-uniform field dis…
Spontaneous Fluxoid Formation in Superconducting Loops
R. Monaco, J. Mygind, R. J. Rivers +1
We report on the first experimental verification of the Zurek-Kibble scenario in an isolated superconducting ring over a wide parameter range. The probability of creating a single…
A quantitative investigation of the effect of a close-fitting superconducting shield on the coil-factor of a solenoid
M. Aaroe, R. Monaco, J. Mygind +1
Superconducting shields are commonly used to suppress external magnetic interference. We show, that an error of almost an order of magnitude can occur in the coil-factor in realist…
Spontaneous Fluxon Production in Annular Josephson Tunnel Junctions in the Presence of a Magnetic Field
R. Monaco, M. Aaroe, J. Mygind +2
We report on the spontaneous production of fluxons in the presence of a symmetry-breaking magnetic field for annular Josephson tunnel junctions during a thermal quench. The depende…
Using Annular Josephson Tunnel Junctions to Monitor Causal Horizon
R. Monaco, R. J. Rivers
If systems change as fast as possible as they pass through a phase transition then the initial domain structure is constrained by causality. We shall show how we can trace these ca…
Zurek-Kibble Mechanism for the Spontaneous Vortex Formation in Josephson Tunnel Junctions: New Theory and Experiment
R. Monaco, J. Mygind, M. Aaroe +2
New scaling behavior has been both predicted and observed in the spontaneous production of fluxons in quenched annular Josephson tunnel junctions as a function o…
Spontaneous Fluxon Formation in Annular Josephson Tunnel Junctions
Roberto Monaco, Jesper Mygind, Ray J. Rivers
It has been argued by Zurek and Kibble that the likelihood of producing defects in a continuous phase transition depends in a characteristic way on the quench rate. In this paper w…